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Foreign Currency Exchange Contracts and Hedging (Details)
1 Months Ended 3 Months Ended 6 Months Ended
Nov. 09, 2017
USD ($)
counterparty
Sep. 30, 2017
USD ($)
counterparty
Sep. 30, 2016
USD ($)
Sep. 30, 2017
USD ($)
counterparty
Sep. 30, 2016
USD ($)
Mar. 31, 2017
USD ($)
Foreign currency exchange contracts and hedging            
Gain (loss) reclassification from AOCI to income, estimate of time to transfer       9 months    
Foreign currency exchange contracts            
Foreign currency exchange contracts and hedging            
Notional amount   $ 165,504,000   $ 165,504,000    
Designated as Hedging Instrument | Foreign currency exchange contracts            
Foreign currency exchange contracts and hedging            
Number of counterparties in derivative contracts | counterparty   4   4    
Derivative, entered into and settled during period, notional amount   $ 32,810,000        
Designated as Hedging Instrument | Derivatives designated as cash flow hedges            
Summary of the effect of derivative instruments on the consolidated statements of income            
Amount of (loss) gain reclassified from accumulated other comprehensive loss into income (effective portion)   (2,283,000) $ 1,851,000 $ (2,283,000) $ 1,676,000  
Amount of gain excluded from effectiveness testing   439,000 163,000 772,000 355,000  
Designated as Hedging Instrument | Derivatives designated as cash flow hedges | Foreign currency exchange contracts            
Summary of the effect of derivative instruments on the consolidated statements of income            
Amount of (loss) gain recognized in other comprehensive income (loss) on derivative instruments (effective portion)   $ (3,900,000) 439,000 $ (9,790,000) 4,903,000  
Not Designated as Hedging Instrument | Foreign currency exchange contracts            
Foreign currency exchange contracts and hedging            
Number of counterparties in derivative contracts | counterparty   6   6    
Summary of the effect of derivative instruments on the consolidated statements of income            
Amount of loss recognized in income on derivative instruments   $ (1,065,000) $ (290,000) $ (2,668,000) $ (881,000)  
Subsequent Event | Foreign currency exchange contracts            
Foreign currency exchange contracts and hedging            
Number of counterparties in derivative contracts | counterparty 6          
Subsequent Event | Designated as Hedging Instrument | Derivatives designated as cash flow hedges | Foreign currency exchange contracts            
Foreign currency exchange contracts and hedging            
Notional amount $ 0          
Subsequent Event | Not Designated as Hedging Instrument | Foreign currency exchange contracts            
Foreign currency exchange contracts and hedging            
Notional amount $ 3,112,000          
Maximum remaining maturity of foreign currency derivatives 4 months          
Fair Value, Measurements, Recurring | Designated as Hedging Instrument            
Foreign currency exchange contracts and hedging            
Fair value recorded in other current assets           $ 1,365,000
Fair Value, Measurements, Recurring | Designated as Hedging Instrument | Derivatives designated as cash flow hedges            
Foreign currency exchange contracts and hedging            
Fair value recorded in other current liabilities   (5,583,000)   (5,583,000)    
Fair Value, Measurements, Recurring | Designated as Hedging Instrument | Derivatives designated as cash flow hedges | Foreign currency exchange contracts            
Foreign currency exchange contracts and hedging            
Notional amount   88,815,000   88,815,000    
Fair value recorded in other current assets   0   0    
Fair Value, Measurements, Recurring | Not Designated as Hedging Instrument            
Foreign currency exchange contracts and hedging            
Fair value recorded in other current assets   509,000   509,000    
Fair value recorded in other current liabilities   (3,177,000)   (3,177,000)    
Fair Value, Measurements, Recurring | Not Designated as Hedging Instrument | Foreign currency exchange contracts            
Foreign currency exchange contracts and hedging            
Notional amount   $ 76,689,000   $ 76,689,000    
Minimum | Designated as Hedging Instrument | Foreign currency exchange contracts            
Foreign currency exchange contracts and hedging            
Maximum remaining maturity of foreign currency derivatives       3 months    
Minimum | Not Designated as Hedging Instrument | Foreign currency exchange contracts            
Foreign currency exchange contracts and hedging            
Maximum remaining maturity of foreign currency derivatives       3 months    
Maximum | Designated as Hedging Instrument | Foreign currency exchange contracts            
Foreign currency exchange contracts and hedging            
Maximum remaining maturity of foreign currency derivatives       6 months    
Maximum | Not Designated as Hedging Instrument | Foreign currency exchange contracts            
Foreign currency exchange contracts and hedging            
Maximum remaining maturity of foreign currency derivatives       6 months