Represents the number of years used in the average of the performance goals for the fiscal years ending in February 2015, which, if higher than the specified performance goal for fiscal 2015, will be used as the basis for determining the performance shares to be awarded.

No definition available.

Share-Based Compensation Plans (Details) (USD $)	3 Months Ended		6 Months Ended				3 Months Ended		6 Months Ended				3 Months Ended	6 Months Ended	3 Months Ended	6 Months Ended			1 Months Ended				3 Months Ended		6 Months Ended
Share-Based Compensation Plans (Details) (USD $)	Aug. 31, 2012 plan	Aug. 31, 2011	Aug. 31, 2012 plan	Aug. 31, 2011	Aug. 31, 2012 Chief Executive Officer and President	Aug. 31, 2012 Chief Executive Officer and President Maximum	Aug. 31, 2012 Stock options	Aug. 31, 2011 Stock options	Aug. 31, 2012 Stock options	Aug. 31, 2011 Stock options	Aug. 31, 2012 Stock options Minimum Y	Aug. 31, 2012 Stock options Maximum Y	Aug. 31, 2012 Restricted stock awards and units Performance based	Aug. 31, 2012 Restricted stock awards and units Performance based	Aug. 31, 2012 Restricted stock Board members	Aug. 31, 2012 Restricted stock Board members	Aug. 31, 2012 Restricted stock Board members Minimum	Aug. 31, 2012 Restricted stock Board members Maximum	Mar. 31, 2012 RSUs Performance based Chief Executive Officer and President	Mar. 31, 2012 RSUs Performance based Chief Executive Officer and President Fiscal 2013 target Maximum	Mar. 31, 2012 RSUs Performance based Chief Executive Officer and President Fiscal 2014 target Maximum	Mar. 31, 2012 RSUs Performance based Chief Executive Officer and President Fiscal 2015 target Maximum Y	Aug. 31, 2012 Employee stock purchase plan	Aug. 31, 2011 Employee stock purchase plan	Aug. 31, 2012 Employee stock purchase plan	Aug. 31, 2011 Employee stock purchase plan
Share-Based Compensation Plans
Number of expired share-based compensation plans	2		2
Number of active share-based compensation plans	3		3
Share-based compensation plans
Granted in period							7,000		308,000
Exercise prices of stock units granted (in dollars per share)											$ 31.68	$ 34.72
Estimated grant date fair value (in dollars per share)											$ 10.17	$ 14.57
Term of award (in years)											P4Y	P5Y
Expected life											4.05	4.35
Risk free interest rates used (as a percent)											0.55%	0.86%
Expected dividend rate (as a percent)									0.00%
Expected volatility rates used (as a percent)											45.11%	52.48%
Granted in period (in shares)															3,750	7,500			700,000	100,000	200,000	700,000
Grant date fair value (in dollars per share)																	$ 30.30	$ 32.88	$ 32.88
Grant Date Fair Value, Total															$ 120,000	$ 240,000			$ 23,020,000
Number of years used in average of performance goals for fiscal years ending February 2015 to determine if higher than fiscal 2015 specified performance goal																						3
Amount of annual bonus payable in the form of cash or cash equivalents						10,000,000
Portion of annual bonus payable in the form of cash or cash equivalents (as a percent)					66.70%
Stock options exercised (in shares)							37,901		130,906
SHARE-BASED PAYMENT EXPENSE
Share-based payment expense	1,527,000	697,000	3,129,000	1,163,000			612,000	538,000	1,159,000	1,004,000			663,000	1,595,000	114,000	237,000							138,000	159,000	138,000	159,000
Less income tax benefits	(193,000)	(27,000)	(458,000)	(52,000)
Share-based payment expense, net of income tax benefits	$ 1,334,000	$ 670,000	$ 2,671,000	$ 1,111,000
Earnings per share impact of share based payment expense:
Basic (in dollars per share)	$ 0.04	$ 0.02	$ 0.08	$ 0.04
Diluted (in dollars per share)	$ 0.04	$ 0.02	$ 0.08	$ 0.04