Shareholders' Equity - Changes in Shareholders' Equity (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	May 31, 2013	May 31, 2012
Shareholders Equity And Share Based Payments [Line Items]
Beginning Balance, Amount	$ 361,216
Beginning Balance, Shares	30,053,443
Net earnings	8,506	3,879
Foreign currency translation, net of deferred tax of $93	150	(2,107)
Stock based compensation	405
Exercise of stock options and restricted stock grants
Stock repurchases	(1)
Stock repurchases, shares	(49)
Ending Balance, Amount	370,276
Ending Balance, Shares	30,053,443
Common Stock [Member]
Shareholders Equity And Share Based Payments [Line Items]
Beginning Balance, Amount	75,134
Beginning Balance, Shares	30,053,443
Net earnings
Foreign currency translation, net of deferred tax of $93
Stock based compensation
Exercise of stock options and restricted stock grants
Stock repurchases
Ending Balance, Amount	75,134
Ending Balance, Shares	30,053,443
Additional Paid-in Capital [Member]
Shareholders Equity And Share Based Payments [Line Items]
Beginning Balance, Amount	122,186
Net earnings
Foreign currency translation, net of deferred tax of $93
Stock based compensation	405
Exercise of stock options and restricted stock grants	(992)
Stock repurchases
Ending Balance, Amount	121,599
Retained Earnings [Member]
Shareholders Equity And Share Based Payments [Line Items]
Beginning Balance, Amount	251,713
Net earnings	8,506
Foreign currency translation, net of deferred tax of $93
Stock based compensation
Exercise of stock options and restricted stock grants
Stock repurchases
Ending Balance, Amount	260,219
Accumulated Other Comprehensive Income (Loss) [Member]
Shareholders Equity And Share Based Payments [Line Items]
Beginning Balance, Amount	(14,903)
Net earnings
Foreign currency translation, net of deferred tax of $93	150
Stock based compensation
Exercise of stock options and restricted stock grants
Stock repurchases
Ending Balance, Amount	(14,753)
Treasury Stock Shares [Member]
Shareholders Equity And Share Based Payments [Line Items]
Beginning Balance, Amount	(72,914)
Beginning Balance, Treasury Stock, Shares	(4,084,765)
Net earnings
Foreign currency translation, net of deferred tax of $93
Stock based compensation
Exercise of stock options and restricted stock grants	992
Exercise of stock options and restricted stock grants, shares	55,530
Stock repurchases	(1)
Stock repurchases, shares	(49)
Ending Balance, Amount	$ (71,923)
Ending Balance, Treasury Stock, Shares	(4,029,284)