Gross Accounts Receivable from Significant Customers as Percentage of Total Consolidated Gross Accounts Receivable (Detail) (Accounts Receivable, Customer Concentration Risk)	Feb. 28, 2013	Feb. 29, 2012
Chrysler LLC
Concentration Risk [Line Items]
Percentage of Consolidated Gross Accounts Receivable	18.00%	18.00%
Ford Motor Company
Concentration Risk [Line Items]
Percentage of Consolidated Gross Accounts Receivable	8.00%	15.00%
U.S. Steel
Concentration Risk [Line Items]
Percentage of Consolidated Gross Accounts Receivable	5.00%	12.00%