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Warranty reserve - Warranty reserve (Details) (USD $)
In Millions, unless otherwise specified
May 02, 2015
Jan. 31, 2015
May 03, 2014
Feb. 01, 2014
Movement in Standard Product Warranty Accrual [Roll Forward]        
Warranty reserve, beginning of period $ 44.6us-gaap_AccruedRentNoncurrent $ 44.9us-gaap_AccruedRentNoncurrent $ 19.4us-gaap_AccruedRentNoncurrent $ 19.1us-gaap_AccruedRentNoncurrent
Warranty expense 3.0us-gaap_StandardProductWarrantyAccrualNoncurrent   1.7us-gaap_StandardProductWarrantyAccrualNoncurrent  
Utilized (3.3)sig_LeaseLossReserve   (1.4)sig_LeaseLossReserve  
Warranty reserve, beginning of period $ 44.6us-gaap_AccruedRentNoncurrent $ 44.9us-gaap_AccruedRentNoncurrent $ 19.4us-gaap_AccruedRentNoncurrent $ 19.1us-gaap_AccruedRentNoncurrent