Accounts Receivable (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Mar. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]
Receivable amounts	$ 437,901	$ 292,723
Less allowance for doubtful accounts	2,390	2,540
Accounts receivable, net	435,511	290,183
Trade Accounts Receivable [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Receivable amounts	433,766	289,013
Other Receivables [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Receivable amounts	$ 4,135	$ 3,710