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Debt - Additional Information (Detail)
€ in Millions
1 Months Ended 6 Months Ended 12 Months Ended
Aug. 03, 2015
USD ($)
Apr. 09, 2015
USD ($)
Apr. 30, 2015
USD ($)
Mar. 31, 2017
USD ($)
Sep. 30, 2016
USD ($)
Apr. 30, 2015
EUR (€)
Debt Instrument [Line Items]            
Credit facilities       $ 90,000,000 $ 155,000,000  
Imputed interest on advance       2.30%    
Government refundable advances       $ 42,139,000 44,994,000  
Present value of minimum lease payment       $ 66,600,000 $ 66,200,000  
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    
Debt instruments maturity date       Apr. 30, 2020 Apr. 30, 2020  
7% Senior Notes, due August 2020            
Debt Instrument [Line Items]            
Debt instruments maturity date       Apr. 30, 2020    
3.625% Senior Notes, Due April 2023            
Debt Instrument [Line Items]            
Debt issuance costs     $ 5,900,000      
Debt instruments maturity date     Apr. 30, 2023 Apr. 30, 2023 Apr. 30, 2023  
Debt instrument, face amount | €           € 330.0
Debt instrument, interest rate       3.625% 3.625% 3.625%
Net proceeds from issuance of debt     $ 350,800,000      
Fair market value of long-term debt and short-term borrowings       $ 357,800,000 $ 365,300,000  
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       1.75%    
Interest rate       2.49%    
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       $ 90,000,000    
Interest rate       2.45%    
Secured Debt | London Interbank Offered Rate (LIBOR)            
Debt Instrument [Line Items]            
Interest rate, basis spread on variable rate       1.75%    
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