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Debt - Additional Information (Detail) (USD $)
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1 Months Ended | 3 Months Ended | 3 Months Ended | 3 Months Ended | 1 Months Ended | ||||||||||||||||
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Nov. 30, 2012
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Nov. 30, 2011
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Nov. 30, 2012
Minimum
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Nov. 30, 2012
Maximum
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Nov. 30, 2012
Libor Rate
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Nov. 30, 2012
Libor Rate
Minimum
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Nov. 30, 2012
Libor Rate
Maximum
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Nov. 30, 2012
Base Rate
Minimum
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Nov. 30, 2012
Base Rate
Maximum
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Apr. 16, 2012
5.625% Senior Notes
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Nov. 30, 2012
5.625% Senior Notes
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Aug. 31, 2012
5.625% Senior Notes
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Apr. 16, 2012
6.875% Senior Notes
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Nov. 30, 2012
Senior Credit Facility
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Nov. 30, 2012
Senior Credit Facility - Revolver
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Nov. 30, 2012
Senior Credit Facility - Revolver
Minimum
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Nov. 30, 2012
Senior Credit Facility - Revolver
Maximum
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Nov. 30, 2012
Senior Credit Facility - Term Loan
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Nov. 30, 2012
Senior Credit Facility - Term Loan
Starting on March 31, 2012
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Nov. 30, 2012
Senior Credit Facility - Term Loan
starting on March 31, 2013
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Mar. 31, 2012
2% Convertible Notes
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| Debt Instrument [Line Items] | |||||||||||||||||||||
| Debt instrument, maturity date | Jun. 15, 2022 | Feb. 23, 2016 | |||||||||||||||||||
| 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 | 1.50% | 1.25% | 2.50% | 0.25% | 1.50% | ||||||||||||||||
| Debt instrument, actual interest rate | 1.75% | ||||||||||||||||||||
| Percentage of non-use fee, annually | 0.20% | 0.40% | |||||||||||||||||||
| Unused credit line | 596,300,000 | ||||||||||||||||||||
| Quarterly installments, payable on term loan | 1,250,000 | 2,500,000 | |||||||||||||||||||
| Leverage ratio | 3.75 | ||||||||||||||||||||
| Fixed charge coverage ratio | 1.50 | ||||||||||||||||||||
| Senior Notes | 300,000,000 | 300,000,000 | 300,000,000 | 250,000,000 | |||||||||||||||||
| Debt instrument, interest rate | 2.00% | 2.00% | 5.625% | 5.625% | 5.625% | 6.875% | |||||||||||||||
| Debt instrument, maturity year | 2022 | 2017 | |||||||||||||||||||
| Debt instrument, payment description | Semiannual interest payments in December and June of each year | ||||||||||||||||||||
| Debt instrument, repurchase amount | 260,400,000 | ||||||||||||||||||||
| Debt instrument, redemption price percentage | 104.00% | ||||||||||||||||||||
| 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 | $ 100,000 | ||||||||||||||||||||