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Debt - Additional Information (Detail) (USD $)
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3 Months Ended | 9 Months Ended | 12 Months Ended | 1 Months Ended | 3 Months Ended | 9 Months Ended | 9 Months Ended | 9 Months Ended | 1 Months Ended | 3 Months Ended | 12 Months Ended | ||||||||||||||||
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May 31, 2012
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May 31, 2012
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May 31, 2011
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Aug. 31, 2011
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May 31, 2012
Minimum
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May 31, 2012
Maximum
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Feb. 23, 2011
Libor Rate
Minimum
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Feb. 23, 2011
Libor Rate
Maximum
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Feb. 23, 2011
Base Rate
Minimum
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Feb. 23, 2011
Base Rate
Maximum
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Apr. 16, 2012
5.625% Senior Notes
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May 31, 2012
5.625% Senior Notes
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May 31, 2012
6.875% Senior Notes
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Aug. 31, 2011
6.875% Senior Notes
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May 31, 2012
Senior Credit Facility
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Feb. 23, 2011
Senior Credit Facility
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May 31, 2012
Senior Credit Facility - Revolver
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Feb. 23, 2011
Senior Credit Facility - Revolver
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May 31, 2012
Senior Credit Facility - Revolver
Minimum
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May 31, 2012
Senior Credit Facility - Revolver
Maximum
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May 31, 2012
Senior Credit Facility - Term Loan
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Feb. 23, 2011
Senior Credit Facility - Term Loan
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Nov. 30, 2003
2% Convertible Notes
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May 31, 2012
2% Convertible Notes
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Nov. 30, 2011
2% Convertible Notes
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Aug. 31, 2011
2% Convertible Notes
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May 31, 2011
2% Convertible Notes
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| Debt Instrument [Line Items] | |||||||||||||||||||||||||||
| Debt instrument, maturity date | Jun. 15, 2022 | Feb. 23, 2016 | Nov. 15, 2023 | ||||||||||||||||||||||||
| Maximum borrowing capacity | $ 600,000,000 | $ 100,000,000 | |||||||||||||||||||||||||
| Senior credit facility expansion option, available | 300,000,000 | ||||||||||||||||||||||||||
| Debt instrument interest rate over variable rate | 1.25% | 2.50% | 0.25% | 1.25% | |||||||||||||||||||||||
| Debt interest rate, actual current spread | 1.75% | 2.00% | 2.25% | ||||||||||||||||||||||||
| Percentage of non-use fee, annually | 0.20% | 0.40% | |||||||||||||||||||||||||
| Unused credit line | 598,300,000 | ||||||||||||||||||||||||||
| 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 | 300,000,000 | 300,000,000 | 249,432,000 | ||||||||||||||||||||||||
| Debt instrument, interest rate | 5.625% | 5.625% | 6.875% | 6.875% | 2.00% | 2.00% | 2.00% | 2.00% | |||||||||||||||||||
| Redemption of 6.875% Senior Notes | 250,000,000 | ||||||||||||||||||||||||||
| Debt instrument, maturity year | 2022 | 2017 | |||||||||||||||||||||||||
| Debt instrument redemption price percentage | 104.00% | ||||||||||||||||||||||||||
| Redemption price of 6.875% Senior Notes, total | 260,400,000 | ||||||||||||||||||||||||||
| Senior subordinated convertible debentures | 150,000,000 | 117,795,000 | |||||||||||||||||||||||||
| Cash paid for repurchase | 32,200,000 | ||||||||||||||||||||||||||
| Average price percentage of par value | 99.30% | ||||||||||||||||||||||||||
| Convertible Notes converted to class A common stock | 200,000 | ||||||||||||||||||||||||||
| Debt conversion converted remaining instrument amount | 117,600,000 | ||||||||||||||||||||||||||
| Number of shares issued due to calling of convertible notes | 5,951,440 | ||||||||||||||||||||||||||
| Repurchases of 2% Convertible Notes | 102,000 | 34,000 | 100,000 | ||||||||||||||||||||||||
| Debt instrument conversion rate | 50.6554 | ||||||||||||||||||||||||||
| Debt conversion principal amount | 1,000 | ||||||||||||||||||||||||||
| Prior income tax to be recaptured | 15,600,000 | ||||||||||||||||||||||||||
| 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 | ||||||||||||||||||||||||||
| Termination date of interest rate swap agreements | April 3, 2012 | ||||||||||||||||||||||||||
| Debt refinancing charges | 16,830,000 | 16,830,000 | |||||||||||||||||||||||||
| Tender premium | 10,400,000 | ||||||||||||||||||||||||||
| Write-off of deferred financing fees and debt discount | 2,300,000 | ||||||||||||||||||||||||||
| Loss on termination of interest rate swap agreements | 4,100,000 | ||||||||||||||||||||||||||
| Related tax benefit on debt refinancing charge | $ (6,300,000) | ||||||||||||||||||||||||||