Share-based Compensation - Additional Information Related to Restricted 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
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense	2,348	1,486	989
Total fair value of restricted shares vesting	$ 1,572	$ 1,579	$ 1,099