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Related party transactions (Details) (USD $)	6 Months Ended
Related party transactions (Details) (USD $)	Jul. 29, 2011	Jul. 30, 2010
Affiliates of KKR and Goldman, Sachs & Co., who may be lenders \| Term Loan Facility
Related party transactions
Principal balance of term loan facility	$ 1,960,000,000
Interest paid on the Term Loan Facility	36,800,000	30,100,000
Goldman, Sachs & Co.
Related party transactions
Notional amount of interest rate swap	143,300,000
Interest rate swap payment	$ 10,600,000	$ 9,100,000

Including current and noncurrent portions, aggregate carrying amount of long-term borrowings as of the balance sheet date before deducting unamortized discount or premiums (if any). May include notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, which had initial maturities beyond one year or beyond the normal operating cycle, if longer.

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