Annual report pursuant to Section 13 and 15(d)

Stock Compensation Plans - Stock Option Awards (Detail)

v3.6.0.2
Stock Compensation Plans - Stock Option Awards (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
12 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2014
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]      
Outstanding, Shares Under Option, Beginning Balance 90 93 146
Exercised, Shares Under Option (7) (2) (52)
Forfeited, Shares Under Option   (1) (1)
Outstanding, Shares Under Option, Ending Balance 83 90 93
Vested or expected to vest, Shares Under Option 83    
Exercisable, Shares Under Option 83    
Outstanding, Weighted Average Exercise Price, Beginning Balance $ 18.57 $ 18.60 $ 16.04
Exercised, Weighted Average Exercise Price 13.30 19.66 11.31
Forfeited, Weighted Average Exercise Price   18.65 19.15
Outstanding, Weighted Average Exercise Price, Ending Balance 19.03 $ 18.57 $ 18.60
Vested or expected to vest, Weighted Average Exercise Price 19.03    
Exercisable, Weighted Average Exercise Price $ 19.03    
Outstanding, Weighted Average Remaining Contractual Term, Ending Balance 4 years 4 months 13 days    
Vested or expected to vest, Weighted Average Remaining Contractual Term 4 years 4 months 13 days    
Exercisable, Weighted Average Remaining Contractual Term 4 years 4 months 13 days    
Outstanding, Aggregate Intrinsic Value, Ending Balance $ 238    
Vested or expected to vest, Aggregate Intrinsic Value 238    
Exercisable, Aggregate Intrinsic Value $ 238