Share-Based Compensation Plans (Details) (USD $)	3 Months Ended						1 Months Ended	3 Months Ended	1 Months Ended	3 Months Ended	1 Months Ended
	May 31, 2012 plan	May 31, 2011	May 31, 2012 Stock options	May 31, 2011 Stock options	May 31, 2012 Stock options Minimum Y	May 31, 2012 Stock options Maximum Y	Mar. 31, 2012 Restricted stock Board members	May 31, 2012 Restricted stock Board members	Mar. 31, 2012 RSUs Performance based Chief Executive Officer and President	May 31, 2012 RSUs Performance based Chief Executive Officer and President	Mar. 31, 2012 RSUs Performance based - fiscal 2013 target Chief Executive Officer and President Maximum	Mar. 31, 2012 RSUs Performance based - fiscal 2014 target Chief Executive Officer and President Maximum	Mar. 31, 2012 RSUs Performance based - fiscal 2015 target Chief Executive Officer and President Y	Mar. 31, 2012 RSUs Performance based - fiscal 2015 target Chief Executive Officer and President Maximum
Share-Based Compensation Plans
Number of expired share-based compensation plans	2
Number of active share-based compensation plans	3
Share-based compensation plans
Granted in period			301,000
Exercise prices of stock units granted (in dollars per share)					$ 32.52	$ 34.72
Estimated grant date fair value (in dollars per share)					$ 13.16	$ 14.57
Term of award (in years)					P4Y	P5Y
Expected life					4.05	4.35
Risk free interest rates used (as a percent)					0.61%	0.86%
Expected dividend rate (as a percent)					0.00%	0.00%
Expected volatility rates used (as a percent)					50.95%	52.48%
Granted in period (in shares)							3,750		700,000		100,000	200,000		700,000
Fair values at the date of grant of awards granted (in dollars per share)							$ 32.88		$ 32.88
Grant Date Fair Value, Total							$ 120,000
Grant Date Fair Value, Total									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
Stock options exercised (in shares)			93,005
SHARE-BASED PAYMENT EXPENSE
Share-based payment expense	1,602,000	466,000	547,000	466,000				123,000		932,000
Less income tax benefits	(265,000)	(25,000)
Share-based payment expense, net of income tax benefits	$ 1,337,000	$ 441,000
Earnings per share impact of share based payment expense:
Basic (in dollars per share)	$ 0.04	$ 0.01
Diluted (in dollars per share)	$ 0.04	$ 0.01