Assumptions Used in Determining Net Periodic Benefit Cost (Detail)	12 Months Ended
	Feb. 28, 2013	Feb. 29, 2012	Feb. 28, 2011
Assumptions Used in Determining Net Periodic Benefit Cost:
Expected Long-Term Rate of Return on Assets	6.60%	7.00%	7.50%
Minimum
Assumptions Used in Determining Net Periodic Benefit Cost:
Discount Rate	4.00%	5.22%	5.64%
Maximum
Assumptions Used in Determining Net Periodic Benefit Cost:
Discount Rate	4.23%	5.50%	5.94%