Intangible Assets - Gross Carrying Amount and Accumulated Amortization of Other Intangible Assets (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Mar. 31, 2017	Sep. 30, 2016
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 61,807	$ 61,807	$ 57,407
Accumulated Amortization	19,609	17,928	16,247
Tradenames and Trademarks [Member]
Acquired Indefinite-lived Intangible Assets [Line Items]
Gross Carrying Amount	19,953	19,953	15,553
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	39,757	39,757	39,757
Accumulated Amortization	18,050	16,495	14,940
Patents [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	1,164	1,164	1,164
Accumulated Amortization	883	825	767
Trademarks [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	403	403	403
Accumulated Amortization	378	363	348
Non-compete [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	530	530	530
Accumulated Amortization	$ 298	$ 245	$ 192