Summary of Significant Accounting Policies (Incentive Compensation) (Details) - Deferred Bonus - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Discretionary bonus payments, profit achievement before taxes	$ 500	$ 110	$ 2,300
Discretionary bonus payments, revenue achievement percent (minimum)	10.00%	10.00%
Discretionary bonus payments, revenue achievement (minimum)			$ 90,400
Minimum
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Discretionary bonus payments, percentage	35.00%	35.00%	35.00%
Maximum
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Discretionary bonus payments, percentage	100.00%	100.00%	100.00%