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Fair Value Measurements (Details) - USD ($)
 3 Months Ended 6 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Mar. 31, 2017
Forward Foreign Currency Exchange Contracts [Member]          
Other liabilities [Abstract]          
Net gain (loss) on forward foreign currency exchange contracts $ (330,000) $ (507,000) $ 722,000 $ (1,186,000)  
Supplier Warrant [Member]          
Change in warrant liability measured at fair value recurring basis using significant unobservable inputs (Level 3) [Roll Forward]          
Beginning balance 10,586,000 10,054,000 11,879,000 15,643,000  
Newly issued 0 0 0 0  
Total (gain) loss included in net income (loss) (1,020,000) 824,000 (2,313,000) (4,765,000)  
Exercises/settlements [1] (9,566,000) 0 (9,566,000) 0  
Net transfers in (out) of Level 3 0 0 0 0  
Ending balance 0 10,878,000 0 10,878,000  
Contingent Consideration [Member]          
Change in warrant liability measured at fair value recurring basis using significant unobservable inputs (Level 3) [Roll Forward]          
Beginning balance 0 314,000 0 330,000  
Newly issued 0 0 0 0  
Total (gain) loss included in net income (loss) 0 0 0 (16,000)  
Exercises/settlements [1] 0 (314,000) 0 (314,000)  
Net transfers in (out) of Level 3 0 0 0 0  
Ending balance 0 $ 0 0 $ 0  
Recurring [Member]          
Short-term investments [Abstract]          
Mutual funds 2,568,000   2,568,000   $ 2,140,000
Prepaid expenses and other current assets [Abstract]          
Forward foreign currency exchange contracts 1,149,000   1,149,000   427,000
Other current liabilities [Abstract]          
Deferred compensation 2,568,000   2,568,000   2,140,000
Other liabilities [Abstract]          
Warrant liability 0   0   11,879,000
Recurring [Member] | Level 1 [Member]          
Short-term investments [Abstract]          
Mutual funds 2,568,000   2,568,000   2,140,000
Prepaid expenses and other current assets [Abstract]          
Forward foreign currency exchange contracts 0   0   0
Other current liabilities [Abstract]          
Deferred compensation 2,568,000   2,568,000   2,140,000
Other liabilities [Abstract]          
Warrant liability 0   0   0
Recurring [Member] | Level 2 [Member]          
Short-term investments [Abstract]          
Mutual funds 0   0   0
Prepaid expenses and other current assets [Abstract]          
Forward foreign currency exchange contracts 1,149,000   1,149,000   427,000
Other current liabilities [Abstract]          
Deferred compensation 0   0   0
Other liabilities [Abstract]          
Warrant liability 0   0   0
Recurring [Member] | Level 3 [Member]          
Short-term investments [Abstract]          
Mutual funds 0   0   0
Prepaid expenses and other current assets [Abstract]          
Forward foreign currency exchange contracts 0   0   0
Other current liabilities [Abstract]          
Deferred compensation 0   0   0
Other liabilities [Abstract]          
Warrant liability $ 0   $ 0   $ 11,879,000
[1] Represents the fair value of the Supplier Warrant as of the exercise date (see Note 8).