Components of Net Periodic Benefit Cost for Defined Benefit Plans and Other Post Retirement Plan (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Nov. 30, 2012	Nov. 30, 2011	Nov. 30, 2012	Nov. 30, 2011
Pension Plans, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Interest Cost	$ 146	$ 174	$ 437	$ 508
Expected Return on Plan Assets	(143)	(124)	(428)	(433)
Amortization of Net Loss	164	120	491	323
Total Net Periodic Benefit Cost	167	170	500	398
Other Postretirement Benefit Plans, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Service Cost	6	5	17	15
Interest Cost	19	21	58	64
Amortization of Unrecognized Prior Service Cost	(69)	(69)	(207)	(207)
Amortization of Net Loss	49	47	147	141
Total Net Periodic Benefit Cost	$ 5	$ 4	$ 15	$ 13