Income Taxes - Additional Information (Detail) (USD $)	12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2012
Capital loss carryforward	$ 0	$ 428,000	$ 424,000
Reduction to taxes payable due to stock-based compensation	2,500,000
Excess tax benefit from stock-based compensation	2,118,000	8,113,000	150,000
Additional Paid-in Capital
Excess tax benefit from stock-based compensation	2,118,000	8,113,000	150,000
Fiscal 2009
Capital loss carryforward		$ 5,100,000