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Goodwill and Intangible Assets (Details 1) - USD ($)
$ in Thousands
6 Months Ended
Sep. 30, 2017
Apr. 01, 2017
Gross Carrying Amount $ 188,090 $ 192,792
Accumulated Amortization 34,302 30,191
Non-amortizable repair station certifications 34,200 34,200
Total $ 222,290 226,992
Product Approvals [Member]    
Weighted Average Useful Lives 24 years  
Gross Carrying Amount $ 50,878 53,869
Accumulated Amortization $ 7,294 6,465
Customer Relationships and Lists [Member]    
Weighted Average Useful Lives 24 years  
Gross Carrying Amount $ 106,583 107,864
Accumulated Amortization $ 14,355 12,308
Trade Names [Member]    
Weighted Average Useful Lives 10 years  
Gross Carrying Amount $ 18,734 19,923
Accumulated Amortization $ 5,834 5,137
Distributor Agreements [Member]    
Weighted Average Useful Lives 5 years  
Gross Carrying Amount $ 722 722
Accumulated Amortization $ 722 722
Patents And Trademarks [Member]    
Weighted Average Useful Lives 16 years  
Gross Carrying Amount $ 9,379 8,803
Accumulated Amortization $ 4,481 4,130
Domain Names [Member]    
Weighted Average Useful Lives 10 years  
Gross Carrying Amount $ 437 437
Accumulated Amortization $ 408 386
Other Intangible Assets [Member]    
Weighted Average Useful Lives 6 years  
Gross Carrying Amount $ 1,357 1,174
Accumulated Amortization $ 1,208 $ 1,043