Income Taxes - Narrative (Details) - USD ($) $ in Thousands	9 Months Ended
	Dec. 31, 2015	Mar. 31, 2015
Operating loss and tax credit carryforwards
Valuation allowance	$ (13,190)	$ (8,836)
Unrecognized tax benefits including interest and penalties	82,643	35,549
Unrecognized tax benefits that would impact effective tax rate	78,988	32,185
Significant change in unrecognized tax benefits is reasonably possible, amount of unrecorded benefit	3,015
Estimated minimum increase (decrease) in earnings related to settlement of unrecognized tax benefits	0
Estimated maximum increase (decrease) in earnings related to settlement of unrecognized tax benefits	2,599
Unrecognized tax benefits, interest on income taxes accrued	1,690	1,476
Unrecognized tax benefits, income tax penalties accrued	307	$ 289
Expire through fiscal 2035
Operating loss and tax credit carryforwards
Tax credit and net operating loss carryforwards	35,539
Indefinite
Operating loss and tax credit carryforwards
Tax credit and net operating loss carryforwards	$ 8,799