Computation of Basic and Diluted Earnings Per Share (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended																12 Months Ended
	Feb. 28, 2013		Nov. 30, 2012		Aug. 31, 2012		May 31, 2012		Feb. 29, 2012		Nov. 30, 2011		Aug. 31, 2011		May 31, 2011		Feb. 28, 2013		Feb. 29, 2012		Feb. 28, 2011
Schedule Of Earnings Per Share Basic And Diluted [Line Items]
Net Income	$ 1,352		$ 2,171		$ 3,253		$ 2,218		$ 17,563		$ 3,726		$ 3,021		$ 4,157		$ 8,994		$ 28,467		$ 12,044
Weighted Average Number of Common Shares Outstanding
Used for Basic Net Loss Per Share																	10,298		11,350		12,906
Dilutive Stock Options																	108		91		51
Dilutive Restricted Stock																	19
Weighted Average Number of Common Shares Outstanding Plus Dilutive Shares																	10,425		11,441		12,957
Basic Net Income Per Share:
Basic Net Income Per Share	$ 0.13	[1]	$ 0.21	[1]	$ 0.31	[1]	$ 0.21	[1]	$ 1.65	[1]	$ 0.35	[1]	$ 0.26	[1]	$ 0.33	[1]	$ 0.87	[1]	$ 2.51	[1]	$ 0.93
Diluted Net Income Per Share:
Diluted Net Income Per Share	$ 0.13	[1]	$ 0.21	[1]	$ 0.31	[1]	$ 0.21	[1]	$ 1.67	[1]	$ 0.34	[1]	$ 0.26	[1]	$ 0.33	[1]	$ 0.86	[1]	$ 2.49	[1]	$ 0.93

[1] The sum of the four quarters is not necessarily the same as the total for the year.