Concentration of Business, Significant Customers and Credit Risk (Details) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Dec. 31, 2017 USD ($) supplier tannery	Dec. 31, 2016 USD ($)	Dec. 31, 2017 USD ($) supplier tannery	Dec. 31, 2016 USD ($)	Mar. 31, 2017 USD ($)
Concentration Risk [Line Items]
Number of tanneries | tannery	2		2
Number of suppliers | supplier	2		2
Property and equipment	$ 215,847		$ 215,847		$ 225,531
International Net Sales
Concentration Risk [Line Items]
Concentration risk (as a percent)	38.10%	35.60%	38.40%	35.90%
Long-lived Assets
Concentration Risk [Line Items]
Concentration risk (as a percent)			10.00%
Accounts Receivable | Unidentified Major Customer One
Concentration Risk [Line Items]
Concentration risk (as a percent)					11.20%
Accounts Receivable | Unidentified Major Customer Two
Concentration Risk [Line Items]
Concentration risk (as a percent)			20.60%
US
Concentration Risk [Line Items]
Property and equipment	$ 198,128		$ 198,128		$ 206,077
All other countries
Concentration Risk [Line Items]
Revenue	$ 282,119	$ 255,126	$ 491,547	$ 435,659
Concentration risk (as a percent)	34.80%	33.60%	32.70%	30.70%
Property and equipment	$ 17,719		$ 17,719		$ 19,454