XML 37 R67.htm IDEA: XBRL DOCUMENT v2.4.0.6
Borrowing Arrangements (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Jan. 31, 2012
Debt Disclosure [Line Items]  
Unsecured revolving credit facility $ 400.0
Unsecured revolving credit facility, option to request an increase in the amount of the credit facility up to 100.0
Extinguishment of Debt, Amount 250.0
Line of credit facility, outstanding borrowings $ 0
Line of credit facility, expiration May 2016