Annual report pursuant to Section 13 and 15(d)

Stock Compensation Plans - Black-Scholes Option-Pricing Model with Weighted Average Assumptions (Detail)

v2.4.0.8
Stock Compensation Plans - Black-Scholes Option-Pricing Model with Weighted Average Assumptions (Detail)
12 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]    
Expected life 3 years 3 years
Volatility 43.17% 75.86%
Risk-free interest rate 0.38% 0.83%
Dividend yield 0.38% 0.47%