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Debt - Additional Information (Detail)
€ in Millions
1 Months Ended 11 Months Ended 12 Months Ended
Sep. 20, 2016
Aug. 03, 2015
USD ($)
Apr. 09, 2015
USD ($)
Apr. 30, 2015
USD ($)
Oct. 02, 2015
USD ($)
Sep. 30, 2016
USD ($)
Apr. 30, 2015
EUR (€)
Debt Instrument [Line Items]              
Credit facility maximum borrowing capacity           $ 353,200,000  
Credit facilities         $ 160,000,000 155,000,000  
Available credit under credit facilities           527,800,000  
Fair market value of long-term debt and short-term borrowings         859,000,000 $ 870,500,000  
Debt instrument, redemption premium         8,750,000    
Write off of unamortized Debt Issuance cost         2,700,000    
Imputed interest on advance           3.40%  
Government refundable advances         $ 43,326,000 $ 44,994,000  
Present value of minimum lease payment           $ 66,200,000  
U.S. Term Loan, due April 2020              
Debt Instrument [Line Items]              
Loan amortization rate           1.25%  
Loan amortization end date           Mar. 31, 2020  
Debt instruments maturity date         Apr. 30, 2020 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         $ 347,700,000 $ 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 2.28%            
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%          
Delayed-Draw Term Loan Facility | U.S. Term Loan, due April 2020              
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           27,800,000  
Credit facility expiration date     Apr. 09, 2020        
Debt issuance costs     $ 2,300,000        
Credit facilities           155,000,000  
Outstanding letters of credit           $ 19,600,000  
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%        
Interest rate           2.27%  
Secured Debt | London Interbank Offered Rate (LIBOR) | Maximum              
Debt Instrument [Line Items]              
Interest rate, basis spread on variable rate     2.00%        
Interest rate           2.29%  
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