Bank Credit Facility (Details) (2011 Credit Agreement [Member], USD $) In Millions, unless otherwise specified	May 04, 2013
2011 Credit Agreement [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 700
Deferred Finance Costs, Gross	3.0
Line of Credit Facility, Canadian Swing Loan Sublimit	10
Line of Credit Facility, Swing Loan Sublimit	30
Line of Credit Facility, Letter of Credit Sublimit	150
Line of Credit Facility, Canadian Revolving Credit Loan Subfacility	200
Line of Credit Facility, Amount Outstanding	137.2
Line of Credit Facility, Letters of Credit Outstanding	8.7
Line of Credit Facility, Remaining Borrowing Capacity	$ 554.1