Share-based Compensation - Additional Information Related to SSARs (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense	$ 3,140	$ 2,119	$ 1,638
Stock Settled Stock Appreciation Rights [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense	792	611	595
Total intrinsic value of SSARs exercised	96	2,131	373
Total fair value of SSARs vesting	$ 779	$ 636	$ 778