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Stock Option Plans - Activity of Unvested Restricted Stock Units and Performance Share Units (Detail) (USD $)
12 Months Ended
Mar. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]  
Beginning balance, unvested shares 71,165
Granted, shares 65,352
Vested, shares (11,017)
Forfeited, shares (36,590)
Ending balance, unvested shares 88,910
Beginning balance, weighted-average grant date fair value of unvested shares $ 21.73
Granted, weighted-average grant date fair value $ 41.36
Vested, weighted-average grant date fair value $ 30.19
Forfeited, weighted-average grant date fair value $ 29.67
Ending balance, weighted-average grant date fair value of unvested shares $ 31.84