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Fair Value Measurements (Details) - USD ($)
3 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Mar. 31, 2018
Forward Foreign Currency Exchange Contracts [Member]      
Other current liabilities [Abstract]      
Net gain (loss) on forward foreign currency exchange contracts $ (2,666,000) $ 1,052,000  
Recurring [Member]      
Short-term investments [Abstract]      
Mutual funds 3,053,000   $ 2,828,000
Prepaid expenses and other current assets [Abstract]      
Forward foreign currency exchange contracts 0   1,179,000
Other current liabilities [Abstract]      
Forward foreign currency exchange contracts 1,487,000   0
Deferred compensation 3,053,000   2,828,000
Recurring [Member] | Level 1 [Member]      
Short-term investments [Abstract]      
Mutual funds 3,053,000   2,828,000
Prepaid expenses and other current assets [Abstract]      
Forward foreign currency exchange contracts 0   0
Other current liabilities [Abstract]      
Forward foreign currency exchange contracts 0   0
Deferred compensation 3,053,000   2,828,000
Recurring [Member] | Level 2 [Member]      
Short-term investments [Abstract]      
Mutual funds 0   0
Prepaid expenses and other current assets [Abstract]      
Forward foreign currency exchange contracts 0   1,179,000
Other current liabilities [Abstract]      
Forward foreign currency exchange contracts 1,487,000   0
Deferred compensation 0   0
Recurring [Member] | Level 3 [Member]      
Short-term investments [Abstract]      
Mutual funds 0   0
Prepaid expenses and other current assets [Abstract]      
Forward foreign currency exchange contracts 0   0
Other current liabilities [Abstract]      
Forward foreign currency exchange contracts 0   0
Deferred compensation $ 0   $ 0