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Subsequent Events	3 Months Ended
Subsequent Events	Apr. 30, 2011
Subsequent Events [Abstract]
Subsequent Events	14. Subsequent Events Subsequent to the 13 weeks ended April 30, 2011, the Company renewed its $60.0 million USD credit facility that can be used for either letters of credit or demand line borrowings. This renewed credit facility expires on May 21, 2012, compared to the previous expiration date of May 22, 2011. No other terms of the agreement changed as a result of this renewal. Additionally, subsequent to the 13 weeks ended April 30, 2011, the Company renewed its $50.0 million USD letter of credit facility. This renewed credit facility expires on May 31, 2012, compared to the previous expiration date of May 27, 2011, and the Company voluntarily reduced the facility from $50.0 million to $35.0 million USD. The Company has evaluated the existence of subsequent events through the filing date of this Quarterly Report on Form 10-Q.