Commitments and Contingencies - Purchase Commitments (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Purchase Commitment
Future commitments
Contract Value	$ 12,200	$ 20,000
Purchase commitment entered into in May 2015
Future commitments
Contract Value	55,200
Remaining Commitment	36,567
Purchase commitment entered into in September 2015
Future commitments
Contract Value	7,200
Remaining Commitment	2,172
Purchase commitment entered into in October 2016 final due date September 2017
Future commitments
Contract Value	16,105
Remaining Commitment	13,427
Purchase commitment entered into in November 2016
Future commitments
Contract Value	24,000
Remaining Commitment	17,003
Purchase commitment entered into in October 2016, final due date September 2018
Future commitments
Contract Value	53,700
Remaining Commitment	$ 53,700
Minimum
Future commitments
Product order period	4 months
Maximum
Future commitments
Product order period	8 months
Sheepskin
Future commitments
Purchase commitment amount	$ 122,869
Purchase commitment period (in years)	2 years
Other Purchase Commitment
Future commitments
Purchase commitment amount	$ 18,942
Inventories
Future commitments
Outstanding purchase orders with manufacturers	$ 392,716