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Stock Option Plan and Stock Based Compensation - Summary of Stock Options Outstanding (Detail)
12 Months Ended
Feb. 29, 2016
$ / shares
shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Number Outstanding, Options Outstanding | shares 370,949
Weighted Average Remaining Contractual Life (in Years), Options Outstanding 5 years 10 months 24 days
Weight Average Exercise Price, Options Outstanding $ 15.38
Number Exercisable, Options Exercisable | shares 294,524
Weight Average Exercise Price, Options Exercisable $ 15.66
Range One [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise Prices, Lower range 8.94
Exercise Prices, Upper range $ 13.69
Number Outstanding, Options Outstanding | shares 85,426
Weighted Average Remaining Contractual Life (in Years), Options Outstanding 6 years 2 months 12 days
Weight Average Exercise Price, Options Outstanding $ 11.35
Number Exercisable, Options Exercisable | shares 42,000
Weight Average Exercise Price, Options Exercisable $ 8.94
Range Two [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise Prices, Lower range 14.05
Exercise Prices, Upper range $ 15.78
Number Outstanding, Options Outstanding | shares 140,280
Weighted Average Remaining Contractual Life (in Years), Options Outstanding 6 years 9 months 18 days
Weight Average Exercise Price, Options Outstanding $ 15.18
Number Exercisable, Options Exercisable | shares 107,281
Weight Average Exercise Price, Options Exercisable $ 15.19
Range Three [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise Prices, Lower range 17.57
Exercise Prices, Upper range $ 18.46
Number Outstanding, Options Outstanding | shares 145,243
Weighted Average Remaining Contractual Life (in Years), Options Outstanding 4 years 8 months 12 days
Weight Average Exercise Price, Options Outstanding $ 17.95
Number Exercisable, Options Exercisable | shares 145,243
Weight Average Exercise Price, Options Exercisable $ 17.95