Annual report pursuant to Section 13 and 15(d)

Debt - Additional Information (Detail)

v2.4.0.8
Debt - Additional Information (Detail) (USD $)
0 Months Ended 12 Months Ended 12 Months Ended 1 Months Ended 3 Months Ended 3 Months Ended 12 Months Ended 12 Months Ended
Apr. 03, 2012
Aug. 31, 2014
Aug. 31, 2013
Aug. 31, 2012
Aug. 31, 2011
Aug. 31, 2014
5.625% Senior Notes
Senior Notes
Aug. 31, 2013
5.625% Senior Notes
Senior Notes
Aug. 31, 2012
5.625% Senior Notes
Senior Notes
Apr. 16, 2012
5.625% Senior Notes
Senior Notes
Aug. 31, 2012
6.875% Senior Notes
Senior Notes
Apr. 16, 2012
6.875% Senior Notes
Senior Notes
Apr. 30, 2012
2% Converitble Notes
Convertible Notes
Mar. 31, 2012
2% Converitble Notes
Convertible Notes
Aug. 31, 2013
2% Converitble Notes
Convertible Notes
Aug. 31, 2012
2% Converitble Notes
Convertible Notes
Nov. 30, 2003
2% Converitble Notes
Convertible Notes
Apr. 16, 2012
Minimum
6.875% Senior Notes
Senior Notes
Apr. 16, 2012
Maximum
6.875% Senior Notes
Senior Notes
Aug. 31, 2014
Senior Credit Facility - Term Loan
Aug. 31, 2011
Senior Credit Facility - Term Loan
Aug. 31, 2014
Senior Credit Facility - Term Loan
Starting on September 30, 2014
Aug. 31, 2014
Senior Credit Facility - Term Loan
Starting on September 30, 2015
Aug. 31, 2014
Senior Credit Facility - Revolver
Aug. 31, 2014
Senior Credit Facility - Revolver
Minimum
Aug. 31, 2014
Senior Credit Facility - Revolver
Maximum
Aug. 31, 2014
Senior Credit Facility
covenant
Aug. 31, 2014
Senior Credit Facility
Minimum
Aug. 31, 2014
Senior Credit Facility
Maximum
Aug. 31, 2014
Senior Credit Facility
LIBOR
Aug. 31, 2014
Senior Credit Facility
LIBOR
Minimum
Aug. 31, 2014
Senior Credit Facility
LIBOR
Maximum
Aug. 31, 2014
Senior Credit Facility
Base Rate
Minimum
Aug. 31, 2014
Senior Credit Facility
Base Rate
Maximum
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                                                   1.44%              
Percentage of non-use fee, annually                                               0.15% 0.40%                
Unused credit line                                             593,200,000                    
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% 5.625% 6.875% 6.875%       2.00% 2.00%                                  
Debt Redemption Price As Percentage Of Principal                     104.00%           100.00% 102.80%                              
Senior Notes                     260,400,000                                            
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   0 0 102,000               100,000                                          
Prior income tax to be recaptured                           15,600,000                                      
Derivative, Notional Amount         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 0 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                                              
Cash interest payments   $ 21,000,000 $ 21,000,000 $ 26,000,000