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Debt (Narrative) (Details) (USD $)
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6 Months Ended | 6 Months Ended | 6 Months Ended | 0 Months Ended | 0 Months Ended | 3 Months Ended | 6 Months Ended | 6 Months Ended | ||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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Feb. 29, 2012
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Aug. 31, 2011
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May 31, 2011
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Feb. 28, 2011
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Feb. 29, 2012
Revolving Credit Facility [Member]
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Feb. 29, 2012
Senior Credit Facility [Member]
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May 31, 2011
Senior Credit Facility [Member]
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Feb. 23, 2011
Senior Credit Facility [Member]
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Feb. 22, 2011
Senior Credit Facility [Member]
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Feb. 29, 2012
Senior Credit Facility - Revolver [Member]
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Feb. 23, 2011
Senior Credit Facility - Revolver [Member]
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Feb. 29, 2012
Senior Credit Facility - Term Loan [Member]
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Feb. 23, 2011
Senior Credit Facility - Term Loan [Member]
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Jun. 12, 2007
6.875% Senior Notes [Member]
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Feb. 29, 2012
6.875% Senior Notes [Member]
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Aug. 31, 2011
6.875% Senior Notes [Member]
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May 16, 2011
2% Convertible Notes [Member]
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Nov. 30, 2011
2% Convertible Notes [Member]
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Feb. 29, 2012
2% Convertible Notes [Member]
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Mar. 27, 2012
2% Convertible Notes [Member]
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Aug. 31, 2011
2% Convertible Notes [Member]
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Nov. 30, 2003
2% Convertible Notes [Member]
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Feb. 29, 2012
Maximum [Member]
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Feb. 29, 2012
Maximum [Member]
Revolving Credit Facility [Member]
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Feb. 29, 2012
Minimum [Member]
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Feb. 29, 2012
Minimum [Member]
Revolving Credit Facility [Member]
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Feb. 29, 2012
Class A Common Stock [Member]
2% Convertible Notes [Member]
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Feb. 29, 2012
LIBOR [Member]
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Feb. 23, 2011
LIBOR [Member]
Maximum [Member]
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Feb. 23, 2011
LIBOR [Member]
Minimum [Member]
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Feb. 23, 2011
Base Rate [Member]
Maximum [Member]
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Feb. 23, 2011
Base Rate [Member]
Minimum [Member]
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| Debt Instrument [Line Items] | ||||||||||||||||||||||||||||||||
| Maximum borrowing capacity | $ 700,000,000 | $ 400,000,000 | $ 600,000,000 | $ 100,000,000 | ||||||||||||||||||||||||||||
| Senior Credit Facility expansion option, available | 300,000,000 | |||||||||||||||||||||||||||||||
| Debt instrument interest rate over variable rate | 2.50% | 1.25% | 1.25% | 0.25% | ||||||||||||||||||||||||||||
| Debt interest rate, actual current spread | 1.75% | |||||||||||||||||||||||||||||||
| Debt instrument, effective percentage | 2.10% | 2.40% | ||||||||||||||||||||||||||||||
| Percentage of non-use fee, annually | 0.40% | 0.20% | ||||||||||||||||||||||||||||||
| Unused credit line under revolver | 540,500,000 | |||||||||||||||||||||||||||||||
| Quarterly installments payable on term loan | 1,250,000 | |||||||||||||||||||||||||||||||
| Increased quarterly installments, payable on term loan | 2,500,000 | |||||||||||||||||||||||||||||||
| Leverage ratio | 3.75 | |||||||||||||||||||||||||||||||
| Fixed charge coverage ratio | 1.50 | |||||||||||||||||||||||||||||||
| Senior Notes | 250,000,000 | 249,481,000 | 249,432,000 | |||||||||||||||||||||||||||||
| Debt discount | 1,000,000 | |||||||||||||||||||||||||||||||
| Proceeds from debt, net of issuance costs | 249,000,000 | |||||||||||||||||||||||||||||||
| Senior notes issuance price percentage | 99.607% | |||||||||||||||||||||||||||||||
| Senior notes yield percentage | 6.93% | |||||||||||||||||||||||||||||||
| Debt instrument, maturity date | Feb. 23, 2016 | Jun. 15, 2017 | Nov. 15, 2023 | |||||||||||||||||||||||||||||
| Senior subordinated convertible debentures | 117,591,000 | 117,795,000 | 150,000,000 | |||||||||||||||||||||||||||||
| Frequency of periodic interest payment, annually | November 15 and May 15 of each year | |||||||||||||||||||||||||||||||
| Life of senior notes, years | 10 | |||||||||||||||||||||||||||||||
| Debt instrument, interest rate | 2.00% | 2.00% | 6.875% | 6.875% | 2.00% | 2.00% | 2.00% | |||||||||||||||||||||||||
| Cash paid for repurchase | 32,200,000 | |||||||||||||||||||||||||||||||
| Average price percentage of par value | 99.30% | |||||||||||||||||||||||||||||||
| Convertible Notes converted | 200,000 | |||||||||||||||||||||||||||||||
| Debt conversion converted remaining instrument amount | 117,600,000 | |||||||||||||||||||||||||||||||
| Debt conversion, converted instrument, shares issued | 5,956,619 | |||||||||||||||||||||||||||||||
| Debt instrument conversion rate | 50.6554 | |||||||||||||||||||||||||||||||
| Debt conversion principal amount | 1,000 | 1,000 | ||||||||||||||||||||||||||||||
| Conversion price, per share | $ 19.74 | |||||||||||||||||||||||||||||||
| Minimum percentage of trading price of underlying principal amount required to receive contingent interest | 120.00% | |||||||||||||||||||||||||||||||
| Redemption price as a percentage of principal amount | 100.00% | |||||||||||||||||||||||||||||||
| Increased effective interest rate | 2.70% | |||||||||||||||||||||||||||||||
| Repurchase price as a percentage of principal amount | 100.00% | |||||||||||||||||||||||||||||||
| Notional value of interest rate swap contracts | 100,000,000 | |||||||||||||||||||||||||||||||
| Interest rate swap contracts, maturity date | Mar. 23, 2016 | |||||||||||||||||||||||||||||||
| Fixed interest rate of interest rate swap contracts | 2.06% | |||||||||||||||||||||||||||||||
| Principal amount of Senior Credit Facility variable rate borrowings convertible to fixed interest rate borrowings | 100,000,000 | |||||||||||||||||||||||||||||||
| Fair value of interest rate swap contracts | $ 4,900,000 | $ 4,600,000 | ||||||||||||||||||||||||||||||