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Notes Payable and Financing Arrangements - Additional Information (Detail) (USD $)
 3 Months Ended 6 Months Ended 12 Months Ended 6 Months Ended 1 Months Ended 6 Months Ended 1 Months Ended 1 Months Ended 1 Months Ended 6 Months Ended 12 Months Ended 6 Months Ended
Oct. 31, 2013
Oct. 31, 2012
Oct. 31, 2013
Oct. 31, 2012
Oct. 31, 2013
Maximum
Apr. 30, 2013
Maximum
Oct. 31, 2013
Tender Offer
Maximum
Oct. 31, 2013
Unsecured Revolving Credit Facility
Oct. 31, 2013
Credit Facilities
Jun. 30, 2013
5.875% Senior notes due 2017
Oct. 31, 2013
5.875% Senior notes due 2017
Oct. 31, 2013
5.875% Senior notes due 2017
Additional Debt
Oct. 31, 2013
5.875% Senior notes due 2017
Maximum
Jun. 30, 2013
5.875% Senior notes due 2017
Debt Instrument, Redemption, Period One
Jun. 30, 2013
5.875% Senior notes due 2017
Debt Instrument, Redemption, Period One
Minimum
Jun. 30, 2013
5.875% Senior notes due 2017
Debt Instrument, Redemption, Period One
Maximum
Jun. 30, 2013
5.875% Senior notes due 2017
Debt Instrument, Redemption, Period One
Debt Instrument Redemption Scenario One
Jun. 30, 2013
5.875% Senior notes due 2017
Debt Instrument, Redemption, Period One
Debt Instrument Redemption Scenario Two
Jun. 30, 2013
5.875% Senior notes due 2017
Debt Instrument, Redemption, Period Two
Jun. 30, 2013
5.875% Senior notes due 2017
Debt Instrument, Redemption, Period Two
Minimum
Jun. 30, 2013
5.875% Senior notes due 2017
Debt Instrument, Redemption, Period Two
Maximum
Jun. 30, 2013
5.875% Senior notes due 2017
Debt Instrument, Redemption, Period Two
Debt Instrument Redemption Scenario One
Jun. 30, 2013
5.875% Senior notes due 2017
Debt Instrument, Redemption, Period Two
Debt Instrument Redemption Scenario Two
Oct. 31, 2013
5.875% Senior notes due 2017
Additional Shares Allowed to be Repurchased
Fiscal 2014
Oct. 31, 2013
9.5% Senior notes due 2016
Oct. 31, 2012
9.5% Senior notes due 2016
Apr. 30, 2011
9.5% Senior notes due 2016
Oct. 31, 2013
9.5% Senior notes due 2016
Extinguished Indebtedness
Debt Instrument [Line Items]                                                        
Line of credit facility               $ 75,000,000                                        
Line of credit facility increments               25,000,000                                        
Letter of credit borrowing capacity               175,000,000                                        
Decrease in revolving line of credit                 60,000,000                                      
Credit facility, maturity               Dec. 15, 2016                                        
Interest Description of revolving Line of Credit               Variable rate equal to LIBOR or prime, at our election, plus an applicable margin based on our consolidated leverage ratio                                        
Borrowings outstanding               0                                        
Interest rate on borrowings               3.75%                                        
Notes issued                     47,100,000                               50,000,000  
Value of convertible notes exchanged for senior notes                                                 42,800,000   50,000,000  
Debt instrument, interest rate                     5.875%                               9.50% 9.50%
Debt instrument, maturity Date                   Jun. 15, 2017                                 Jan. 14, 2016  
Payment for repurchase of Senior Notes                                                   6,400,000    
Finance cost of Senior Notes                                                   552,000    
Indebtedness increased                     56,400,000 52,900,000                                
Annual increase in Debt service requirements                     1,800,000                                  
Value of Senior Notes defeased                                                 712,000      
Interest expense 2,046,000 1,344,000 8,719,000 3,331,000                                               4,300,000
Debt issuance write-off costs                                                       795,000
Notice Period of Senior Notes                             30 days 60 days       30 days 60 days              
Description of redemption for senior notes                           (a) upon not less than 30 nor more than 60 days’ prior notice, redeem all or a portion of the 5.875% Senior Notes at a redemption price of 100% of the principal amount of the 5.875% Senior Notes, plus an applicable premium, plus accrued and unpaid interest as of the redemption date; or (b) redeem up to 35% of the aggregate principal amount of the 5.875% Senior Notes with the net cash proceeds of one or more equity offerings at a redemption price of 105.875% of the principal amount of the 5.875% Senior Notes, plus accrued and unpaid interest as of the redemption date; provided that in the case of the foregoing clause, at least 65% of the aggregate original principal amount of the 5.875% Senior Notes remains outstanding, and the redemption occurs within 60 days after the closing of the equity offering.         upon not less than 30 nor more than 60 days’ prior notice, redeem all or a portion of the 5.875% Senior Notes at a redemption price of (a) 102.9375% of the principal amount of the 5.875% Senior Notes to be redeemed, if redeemed during the 12-month period beginning on June 15, 2015; or (b) 100% of the principal amount of the 5.875% Senior Notes to be redeemed, if redeemed during the 12-month period beginning on June 15, 2016, plus, in either case, accrued and unpaid interest on the 5.875% Senior Notes as of the applicable redemption date.                  
Redemption price of Senior Notes                                 100.00% 105.875%       102.9375% 100.00%          
Percentage of redeem notes                                   35.00%                    
Percentage of principal amount that remains outstanding                                 65.00%                      
Senior Notes Indenture, number of shares allowed for repurchase                         30,000,000                     85,000,000        
Senior Notes Indenture, maximum number of shares allowed for repurchase as a percentage of Consolidated net income for previous four consecutive published fiscal quarters                     75.00%                                  
Stock repurchase authorization         $ 115,000,000 $ 35,000,000 $ 75,000,000                                          
Consolidated coverage ratio                     3.00