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Debt - Additional Information (Detail)
€ in Millions
1 Months Ended 2 Months Ended 3 Months Ended 11 Months Ended
Aug. 03, 2015
USD ($)
Apr. 09, 2015
USD ($)
Apr. 08, 2015
USD ($)
Apr. 30, 2015
USD ($)
Oct. 02, 2015
USD ($)
Jan. 01, 2016
USD ($)
Jul. 31, 2015
USD ($)
Oct. 02, 2015
USD ($)
Aug. 04, 2015
USD ($)
Apr. 30, 2015
EUR (€)
Apr. 30, 2013
USD ($)
Aug. 31, 2010
USD ($)
Debt Instrument [Line Items]                        
Credit facilities         $ 160,000,000 $ 150,000,000   $ 160,000,000        
Imputed interest on advance           3.832%            
Government refundable advances         43,300,000 $ 41,500,000   43,300,000        
Debt issuance cost           6,300,000   6,500,000        
Debt issuance cost being netted against current maturities of long term debt           200,000   200,000        
Debt issuance cost being netted against long term debt           $ 6,100,000   6,300,000        
U.S. Term Loan, due April 2020                        
Debt Instrument [Line Items]                        
Funds borrowed under the delayed-draw term Loan $ 250,000,000                      
Loan amortization rate           1.25%            
Loan amortization end date           Mar. 31, 2020            
7% Senior Notes, due August 2020                        
Debt Instrument [Line Items]                        
Debt instruments maturity date           Apr. 30, 2020            
Debt instrument, face amount                       $ 250,000,000
Debt instrument, interest rate                       7.00%
Senior Notes Due Twenty Twenty                        
Debt Instrument [Line Items]                        
Write off of unamortized Debt Issuance cost         2,400,000              
Debt instrument, interest rate                 7.00%      
Debt instrument, redemption premium                 $ 8,750,000      
3.625% Senior Notes, Due April 2023                        
Debt Instrument [Line Items]                        
Debt issuance costs       $ 5,900,000                
Debt instruments maturity date       Apr. 30, 2023                
Debt instrument, face amount | €                   € 330.0    
Debt instrument, interest rate                   3.625%    
Net proceeds from issuance of debt       $ 350,800,000                
Fair market value of long-term debt and short-term borrowings         $ 347,700,000 $ 348,500,000   $ 347,700,000        
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%                
London Interbank Offered Rate (LIBOR) | U.S. Term Loan, due April 2020                        
Debt Instrument [Line Items]                        
Interest rate, basis spread on variable rate           1.50%            
Interest rate           1.93%            
London Interbank Offered Rate (LIBOR) | Minimum | U.S. Term Loan, due April 2020                        
Debt Instrument [Line Items]                        
Interest rate, basis spread on variable rate 1.25%                      
London Interbank Offered Rate (LIBOR) | Maximum | U.S. Term Loan, due April 2020                        
Debt Instrument [Line Items]                        
Interest rate, basis spread on variable rate 2.00%                      
Secured Debt                        
Debt Instrument [Line Items]                        
Credit facility maturity date   Apr. 09, 2020                    
Debt issuance costs   $ 2,300,000                    
Credit facilities           $ 150,000,000            
Secured Debt | London Interbank Offered Rate (LIBOR)                        
Debt Instrument [Line Items]                        
Interest rate, basis spread on variable rate           1.50%            
Credit facility interest rate description           The interest rate 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%                    
Interest rate           1.77%            
Secured Debt | London Interbank Offered Rate (LIBOR) | Maximum                        
Debt Instrument [Line Items]                        
Interest rate, basis spread on variable rate   2.00%                    
Interest rate           1.92%            
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  
Early payment of debt     $ 175,000,000                  
Write off of unamortized Debt Issuance cost             $ 300,000