Share-based Compensation - Additional Information Related to Performance Shares (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
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense	77	22	54
Total fair value of performance share vesting	$ 174	$ 0	$ 0