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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