Summary of Significant Accounting Policies - Valuation and qualifying accounts inventory (Details) - Inventory Valuation and Obsolescence - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Dec. 31, 2015	Mar. 31, 2015
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at the beginning of the year	$ 17,012	$ 13,257
Expense	3,082	993
Write-offs		652
Other adjustments	3,613	2,110
Balance at the end of the year	$ 23,707	$ 17,012