|
Debt - Additional Information (Detail) (USD $)
|
1 Months Ended | 12 Months Ended | 12 Months Ended | 12 Months Ended | 12 Months Ended | 1 Months Ended | 12 Months Ended | 1 Months Ended | 3 Months Ended | 12 Months Ended | ||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
Apr. 03, 2012
|
Aug. 31, 2012
|
Aug. 31, 2011
|
Aug. 31, 2010
|
Aug. 31, 2012
Minimum
|
Aug. 31, 2012
Maximum
|
Aug. 31, 2012
Libor Rate
Minimum
|
Aug. 31, 2012
Libor Rate
Maximum
|
Aug. 31, 2012
Base Rate
Minimum
|
Aug. 31, 2012
Base Rate
Maximum
|
Aug. 31, 2012
Senior Credit Facility
|
Aug. 31, 2012
Senior Credit Facility - Revolver
|
Aug. 31, 2011
Senior Credit Facility - Revolver
|
Aug. 31, 2012
Senior Credit Facility - Revolver
Minimum
|
Aug. 31, 2012
Senior Credit Facility - Revolver
Maximum
|
Aug. 31, 2012
Senior Credit Facility - Term Loan
|
Aug. 31, 2011
Senior Credit Facility - Term Loan
|
Aug. 31, 2012
Senior Credit Facility - Term Loan
Starting on March 31, 2012
|
Aug. 31, 2012
Senior Credit Facility - Term Loan
starting on March 31, 2013
|
Aug. 31, 2012
5.625% Senior Notes
|
Apr. 16, 2012
5.625% Senior Notes
|
Apr. 16, 2012
6.875% Senior Notes
|
Aug. 31, 2012
6.875% Senior Notes
|
Aug. 31, 2011
6.875% Senior Notes
|
Nov. 30, 2003
2% Convertible Notes
|
Mar. 31, 2012
2% Convertible Notes
|
Nov. 30, 2011
2% Convertible Notes
|
Aug. 31, 2012
2% Convertible Notes
|
Aug. 31, 2011
2% Convertible Notes
|
Aug. 31, 2010
2% Convertible Notes
|
|
| Debt Instrument [Line Items] | ||||||||||||||||||||||||||||||
| Debt instrument maturity date | Feb. 23, 2016 | Jun. 15, 2022 | 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% | 1.50% | ||||||||||||||||||||||||||
| Debt instrument actual interest rate | 1.50% | |||||||||||||||||||||||||||||
| 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 | 2,500,000 | ||||||||||||||||||||||||||||
| Leverage ratio | 3.75 | |||||||||||||||||||||||||||||
| Fixed charge coverage ratio | 1.50 | |||||||||||||||||||||||||||||
| Senior Notes | 300,000,000 | 300,000,000 | 249,432,000 | 249,432,000 | ||||||||||||||||||||||||||
| Debt instrument, interest rate | 5.625% | 5.625% | 6.875% | 6.875% | 6.875% | 2.00% | 2.00% | 2.00% | 2.00% | |||||||||||||||||||||
| Senior Notes | 260,400,000 | |||||||||||||||||||||||||||||
| Debt instrument redemption price percentage | 104.00% | |||||||||||||||||||||||||||||
| Senior subordinated convertible debentures | 117,795,000 | 150,000,000 | ||||||||||||||||||||||||||||
| 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 | 22,894,000 | 100,000 | ||||||||||||||||||||||||||
| Prior income tax to be recaptured | 15,600,000 | 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 | 97,500,000 | 158,000,000 | 58,000,000 | 97,500,000 | 100,000,000 | |||||||||||||||||||||||||
| Interest rate swap contracts, maturity date | Mar. 23, 2016 | |||||||||||||||||||||||||||||
| Other long term Liabilities | 4,100,000 | |||||||||||||||||||||||||||||
| Debt refinancing charges | 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 | |||||||||||||||||||||||||||||
| Cash interest payments | $ 25,900,000 | $ 26,100,000 | $ 26,800,000 | |||||||||||||||||||||||||||