Annual report pursuant to Section 13 and 15(d)

Summary of significant accounting policies - Recently Adopted Accounting Pronouncements (Details)

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Summary of significant accounting policies - Recently Adopted Accounting Pronouncements (Details) - USD ($)
$ in Thousands
 1 Months Ended 3 Months Ended 12 Months Ended
Feb. 03, 2018
Feb. 03, 2018
Oct. 28, 2017
Jul. 29, 2017
Apr. 29, 2017
Jan. 28, 2017
Oct. 29, 2016
Jul. 30, 2016
Apr. 30, 2016
Feb. 03, 2018
Jan. 28, 2017
Jan. 30, 2016
Item effected                        
Effect on provision for income tax $ (9,778) $ 46,605 $ 58,338 $ 66,162 $ 60,520 $ 84,128 $ 52,310 $ 54,013 $ 55,503 $ 231,625 $ 245,954 $ 187,432
ASU 2016 09, Compensation – Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting                        
Item effected                        
Effect on provision for income tax                   $ (10,024)