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Shares Outstanding by Ranges of Exercise Prices (Detail)
12 Months Ended
Mar. 03, 2018
$ / shares
shares
$4.24 - $6.59  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Shares outstanding, Ranges of Exercise Prices, Lower Range Limit $ 4.24
Shares outstanding, Ranges of Exercise Prices, Upper Range Limit $ 6.59
Total Shares | shares | shares 19,500
Weighted Average Exercise Price $ 5.38
Weighted Average Remaining Contractual Life (in years) 4 years 8 months 19 days
Shares Currently Exercisable | shares | shares 10,000
Weighted Average Exercise Price- Exercisable Shares $ 4.24
$6.68 - $11.47  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Shares outstanding, Ranges of Exercise Prices, Lower Range Limit 6.68
Shares outstanding, Ranges of Exercise Prices, Upper Range Limit $ 11.47
Total Shares | shares | shares 371,569
Weighted Average Exercise Price $ 6.83
Weighted Average Remaining Contractual Life (in years) 7 years 11 months 12 days
Shares Currently Exercisable | shares | shares 52,725
Weighted Average Exercise Price- Exercisable Shares $ 7.68
$14.04 - $23.19  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Shares outstanding, Ranges of Exercise Prices, Lower Range Limit 14.04
Shares outstanding, Ranges of Exercise Prices, Upper Range Limit $ 23.19
Total Shares | shares | shares 14,200
Weighted Average Exercise Price $ 17.43
Weighted Average Remaining Contractual Life (in years) 5 years 11 months 8 days
Shares Currently Exercisable | shares | shares 10,525
Weighted Average Exercise Price- Exercisable Shares $ 18.43