Quarterly report pursuant to Section 13 or 15(d)

Goodwill and Other Intangible Assets Intangible Assets (Details)

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Goodwill and Other Intangible Assets Intangible Assets (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Mar. 31, 2017
Acquired Finite-Lived Intangible Assets [Line Items]    
Finite-Lived Intangible Assets, Accumulated Amortization $ 79,122 $ 70,925
Intangible Assets, Gross (Excluding Goodwill) 162,068 157,103
Intangible Assets, Net (Excluding Goodwill) 82,946 86,178
Developed Technology Rights    
Acquired Finite-Lived Intangible Assets [Line Items]    
Finite-Lived Intangible Assets, Gross 10,159 9,796
Finite-Lived Intangible Assets, Accumulated Amortization 3,844 3,454
Finite-Lived Intangible Assets, Net 6,315 6,342
Customer Relationships    
Acquired Finite-Lived Intangible Assets [Line Items]    
Finite-Lived Intangible Assets, Gross 102,660 99,676
Finite-Lived Intangible Assets, Accumulated Amortization 72,206 64,682
Finite-Lived Intangible Assets, Net 30,454 34,994
Other Intangible Assets    
Acquired Finite-Lived Intangible Assets [Line Items]    
Finite-Lived Intangible Assets, Gross 2,639 2,626
Finite-Lived Intangible Assets, Accumulated Amortization 2,415 2,268
Finite-Lived Intangible Assets, Net 224 358
Certification Marks    
Acquired Finite-Lived Intangible Assets [Line Items]    
Indefinite-Lived Intangible Assets (Excluding Goodwill) $ 458 $ 442