Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income (Loss) (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Feb. 28, 2013	Feb. 29, 2012	Feb. 28, 2011
Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income (Loss)
Net Amount Recognized	$ (228)	$ 1,290	$ (3,006)
Pension Plans, Defined Benefit
Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income (Loss)
Net (Gain) or Loss	5	2,333
Prior Service Cost (Credit)
Adjustment for 2007 Plan Amendment
Amortization of Net (Gain) or Loss	(630)	(431)
Net Amount Recognized	(625)	1,902
Other Postretirement Benefit Plans, Defined Benefit
Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income (Loss)
Net (Gain) or Loss	163	95
Amortization of Prior Service Cost (Credit)	276	276
Prior Service Cost (Credit)
Adjustment for 2007 Plan Amendment
Amortization of Net (Gain) or Loss	(196)	(188)
Net Amount Recognized	$ 243	$ 183