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Stock Option Plan and Stock Based Compensation - Summary of Stock Options Outstanding (Detail)
12 Months Ended
Feb. 28, 2017
$ / shares
shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Number Outstanding, Options Outstanding | shares 172,496
Weighted Average Remaining Contractual Life (in Years), Options Outstanding 4 years 2 months 12 days
Weight Average Exercise Price, Options Outstanding $ 15.95
Number Exercisable, Options Exercisable | shares 167,423
Weight Average Exercise Price, Options Exercisable $ 16.00
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 24,848
Weighted Average Remaining Contractual Life (in Years), Options Outstanding 3 years 3 months 18 days
Weight Average Exercise Price, Options Outstanding $ 9.87
Number Exercisable, Options Exercisable | shares 21,616
Weight Average Exercise Price, Options Exercisable $ 9.30
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 51,956
Weighted Average Remaining Contractual Life (in Years), Options Outstanding 5 years 7 months 6 days
Weight Average Exercise Price, Options Outstanding $ 15.16
Number Exercisable, Options Exercisable | shares 50,115
Weight Average Exercise Price, Options Exercisable $ 15.13
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 95,692
Weighted Average Remaining Contractual Life (in Years), Options Outstanding 3 years 8 months 12 days
Weight Average Exercise Price, Options Outstanding $ 17.97
Number Exercisable, Options Exercisable | shares 95,692
Weight Average Exercise Price, Options Exercisable $ 17.97