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Debt - Additional Information (Detail) (USD $)
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0 Months Ended | 12 Months Ended | 12 Months Ended | 1 Months Ended | 3 Months Ended | 12 Months Ended | 3 Months Ended | 3 Months Ended | 12 Months Ended | |||||||||||||||||||||
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Apr. 03, 2012
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Aug. 31, 2013
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Aug. 31, 2012
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Aug. 31, 2011
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Aug. 31, 2013
5.625% Senior Notes
Senior Notes
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Aug. 31, 2012
5.625% Senior Notes
Senior Notes
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Apr. 16, 2012
5.625% Senior Notes
Senior Notes
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Aug. 31, 2012
6.875% Senior Notes
Senior Notes
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Apr. 16, 2012
6.875% Senior Notes
Senior Notes
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Apr. 30, 2012
2% Converitble Notes
Convertible Notes
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Mar. 31, 2012
2% Converitble Notes
Convertible Notes
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Nov. 30, 2011
2% Converitble Notes
Convertible Notes
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Aug. 31, 2012
2% Converitble Notes
Convertible Notes
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Aug. 31, 2011
2% Converitble Notes
Convertible Notes
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Nov. 30, 2003
2% Converitble Notes
Convertible Notes
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Aug. 31, 2013
Senior Credit Facility - Term Loan
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Aug. 31, 2011
Senior Credit Facility - Term Loan
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Aug. 31, 2013
Senior Credit Facility - Term Loan
Starting on September 30, 2014
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Aug. 31, 2013
Senior Credit Facility - Term Loan
Starting on September 30, 2015
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Aug. 31, 2013
Senior Credit Facility - Revolver
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Aug. 31, 2013
Senior Credit Facility - Revolver
Minimum
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Aug. 31, 2013
Senior Credit Facility - Revolver
Maximum
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Aug. 31, 2013
Senior Credit Facility
covenant
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Aug. 31, 2013
Senior Credit Facility
Minimum
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Aug. 31, 2013
Senior Credit Facility
Maximum
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Aug. 31, 2013
Senior Credit Facility
LIBOR
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Aug. 31, 2013
Senior Credit Facility
LIBOR
Minimum
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Aug. 31, 2013
Senior Credit Facility
LIBOR
Maximum
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Aug. 31, 2013
Senior Credit Facility
Base Rate
Minimum
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Aug. 31, 2013
Senior Credit Facility
Base Rate
Maximum
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| Debt Instrument [Line Items] | ||||||||||||||||||||||||||||||
| Maximum borrowing capacity | $ 90,000,000 | $ 600,000,000.0 | ||||||||||||||||||||||||||||
| Senior credit facility expansion option, available | 350,000,000 | |||||||||||||||||||||||||||||
| Debt instrument interest rate over variable rate | 1.25% | 1.00% | 2.50% | 0.00% | 1.50% | |||||||||||||||||||||||||
| Debt instrument actual interest rate | 1.50% | |||||||||||||||||||||||||||||
| Percentage of non-use fee, annually | 0.15% | 0.40% | ||||||||||||||||||||||||||||
| Unused credit line | 471,600,000 | |||||||||||||||||||||||||||||
| Quarterly installments, payable on term loan | 1,100,000 | 2,300,000 | ||||||||||||||||||||||||||||
| Number of financial covenants | 2 | |||||||||||||||||||||||||||||
| Leverage ratio | 3.75 | |||||||||||||||||||||||||||||
| Fixed charge coverage ratio | 3.50 | |||||||||||||||||||||||||||||
| Face amount | 300,000,000 | 300,000,000.0 | 250,000,000 | 150,000,000.0 | ||||||||||||||||||||||||||
| Debt instrument, interest rate | 5.625% | 5.625% | 5.625% | 6.875% | 6.875% | 2.00% | 2.00% | 2.00% | ||||||||||||||||||||||
| Debt instrument redemption price percentage | 104.00% | |||||||||||||||||||||||||||||
| Senior Notes | 260,400,000 | |||||||||||||||||||||||||||||
| 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 | |||||||||||||||||||||||||||||
| Conversion ratio per $1,000 of principal | 50.6554 | |||||||||||||||||||||||||||||
| Number of shares issued due to calling of convertible notes | 5,951,440 | |||||||||||||||||||||||||||||
| Repurchases of 2% Convertible Notes | 0 | 102,000 | 34,000 | 100,000 | ||||||||||||||||||||||||||
| Prior income tax to be recaptured | 15,600,000 | |||||||||||||||||||||||||||||
| Notional value of interest rate swap contracts | 100,000,000 | |||||||||||||||||||||||||||||
| Fixed interest rate of interest rate swap contracts | 2.06% | |||||||||||||||||||||||||||||
| Senior Credit Facility | 100,000,000 | |||||||||||||||||||||||||||||
| Other long term Liabilities | 4,100,000 | |||||||||||||||||||||||||||||
| Debt refinancing costs | 0 | 16,830,000 | 0 | |||||||||||||||||||||||||||
| 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 | |||||||||||||||||||||||||||||
| Cash interest payments | $ 20,800,000 | $ 25,900,000 | $ 26,100,000 | |||||||||||||||||||||||||||