Fair Value Measurements - Changes in Fair Value of Level 3 Assets and Liabilities on a Recurring Basis (Details) (Corporate-owned life insurance [Member], USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Corporate-owned life insurance [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period	$ 4,360	$ 3,673
Realized gains	57	0
Unrealized gain relating to instruments held at reporting date	65	600
Purchases, sales, issuances and settlements, net	(1,989)	87
Balance at end of period	$ 2,493	$ 4,360