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Debt - Additional Information (Detail)
€ in Millions
1 Months Ended 3 Months Ended 9 Months Ended
Aug. 04, 2015
USD ($)
Aug. 03, 2015
USD ($)
Apr. 09, 2015
USD ($)
Apr. 08, 2015
USD ($)
Apr. 30, 2015
USD ($)
Apr. 30, 2013
USD ($)
Aug. 31, 2010
USD ($)
Oct. 30, 2015
USD ($)
Jul. 31, 2015
USD ($)
May. 01, 2015
USD ($)
Aug. 01, 2014
USD ($)
Jul. 31, 2015
USD ($)
Aug. 01, 2014
USD ($)
Apr. 30, 2015
EUR (€)
Oct. 31, 2014
USD ($)
Mar. 31, 2011
USD ($)
Debt Instrument [Line Items]                                
Credit facilities                 $ 200,000,000     $ 200,000,000     $ 100,000,000  
Loss on extinguishment of debt                 $ 0   $ (533,000) $ (329,000) $ (533,000)      
Imputed interest on advance                 4.29%     4.29%        
Discounted value of debt                 $ 43,200,000     $ 43,200,000     51,900,000  
Senior Notes 7% Maturing in August 2020                                
Debt Instrument [Line Items]                                
Debt instrument, carrying amount             $ 250,000,000                  
Debt instrument, interest rate             7.00%                  
Debt issuance costs             $ 4,400,000                  
Net proceeds from issuance of debt             $ 245,600,000                  
Senior Notes 7% Maturing in August 2020 | Debt Redemption After August 1, 2015                                
Debt Instrument [Line Items]                                
Debt instrument redemption price percentage plus accrued interest             103.50%                  
Senior Notes 7% Maturing in August 2020 | Debt Redemption After August 1, 2018                                
Debt Instrument [Line Items]                                
Debt instrument redemption price percentage plus accrued interest             100.00%                  
Senior Notes 7% Maturing in August 2020 | Debt Redemption Prior August 1, 2015                                
Debt Instrument [Line Items]                                
Debt instrument redemption price percentage plus accrued interest             100.00%                  
Senior Notes Due Twenty Twenty                                
Debt Instrument [Line Items]                                
Debt instrument, fair value                 255,300,000     255,300,000     $ 266,900,000  
Senior Notes Due Twenty Twenty | Scenario Forecast                                
Debt Instrument [Line Items]                                
Write off of unamortized Debt Issuance cost               $ 2,400,000                
Senior Notes Due Twenty Twenty | Subsequent Event                                
Debt Instrument [Line Items]                                
Loss on extinguishment of debt $ 8,750,000                              
Debt instrument, interest rate 7.00%                              
3.625% Senior Notes Due April 2023                                
Debt Instrument [Line Items]                                
Loan amount paid off date         Apr. 30, 2023                      
Debt instrument, carrying amount | €                           € 330.0    
Debt instrument, interest rate                           3.625%    
Debt issuance costs         $ 5,700,000                      
Net proceeds from issuance of debt         $ 350,800,000                      
Debt instrument, fair value                 352,500,000     352,500,000        
3.625% Senior Notes Due April 2023 | Debt Redemption Prior April 15, 2018                                
Debt Instrument [Line Items]                                
Debt instrument redemption price percentage plus accrued interest         100.00%                      
Debt instrument redemption allowed percentage of principal amount redeemed         35.00%                      
3.625% Senior Notes Due April 2023 | Debt Redemption After April 15, 2018                                
Debt Instrument [Line Items]                                
Debt instrument redemption price percentage plus accrued interest         102.719%                      
3.625% Senior Notes Due April 2023 | Debt Redemption After April 15, 2021                                
Debt Instrument [Line Items]                                
Debt instrument redemption price percentage plus accrued interest         100.00%                      
Delayed-Draw Term Loan Facility | Amended Credit Facility | Subsequent Event                                
Debt Instrument [Line Items]                                
Funds borrowed under the delayed-draw term Loan   $ 250,000,000                            
Secured Debt                                
Debt Instrument [Line Items]                                
Credit facility maximum borrowing capacity                               $ 460,000,000
Credit facility expiration date     Apr. 09, 2020                          
Credit facilities                 $ 200,000,000     $ 200,000,000        
Secured Debt | London Interbank Offered Rate (LIBOR)                                
Debt Instrument [Line Items]                                
Interest rate, basis spread on variable rate                       1.50%        
Interest rate                 1.69%     1.69%        
Credit facility interest rate description                       The interest rate on the credit facility ranges from LIBOR plus 1.25% to LIBOR plus 2.00% depending on the leverage ratios at the time the funds are drawn.        
Secured Debt | London Interbank Offered Rate (LIBOR) | Minimum                                
Debt Instrument [Line Items]                                
Interest rate, basis spread on variable rate     1.25%                          
Secured Debt | London Interbank Offered Rate (LIBOR) | Maximum                                
Debt Instrument [Line Items]                                
Interest rate, basis spread on variable rate     2.00%                          
Secured Debt | Revolving Credit Facility                                
Debt Instrument [Line Items]                                
Credit facility maximum borrowing capacity     $ 500,000,000                          
Secured Debt | Delayed-Draw Term Loan Facility                                
Debt Instrument [Line Items]                                
Credit facility maximum borrowing capacity     $ 250,000,000                          
U S Term Loan                                
Debt Instrument [Line Items]                                
Term Loan           $ 175,000,000                    
Loan amount paid off date                       Apr. 07, 2015        
Early payment of debt       $ 175,000,000                        
Loss on extinguishment of debt                   $ (300,000)            
U S Term Loan | London Interbank Offered Rate (LIBOR)                                
Debt Instrument [Line Items]                                
Credit facility interest rate description                       The interest rate on the U.S. Term Loan ranges from LIBOR plus 1.5% to LIBOR plus 2.25% depending on the leverage ratios at the time the funds are drawn.        
U S Term Loan | London Interbank Offered Rate (LIBOR) | Minimum                                
Debt Instrument [Line Items]                                
Interest rate, basis spread on variable rate           1.50%                    
U S Term Loan | London Interbank Offered Rate (LIBOR) | Maximum                                
Debt Instrument [Line Items]                                
Interest rate, basis spread on variable rate           2.25%                    
7 % Senior Notes Due August 1, 2020                                
Debt Instrument [Line Items]                                
Loan amount paid off date                       Aug. 01, 2020