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Derivatives and hedging activities (Details) (USD $)
3 Months Ended 3 Months Ended
May 03, 2013
May 04, 2012
May 03, 2013
Interest rate swaps and treasury locks
May 03, 2013
Interest rate swaps
May 03, 2013
Treasury locks
Apr. 11, 2013
Treasury locks
Cash flow hedges of interest rate risk            
Combined notional value       $ 875,000,000   $ 700,000,000
Loss related to effective portion of derivatives recognized in OCI 15,327,000 36,000     13,200,000  
Amortization period for loss deferred to OCI         10 years  
Loss related to ineffective portion of derivatives recognized in Other (income) expense   42,000     0  
Estimated amount to be reclassified during the next 52 week period     $ 4,700,000