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Common Shares, Treasury Shares, Reserves and Dividends - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 12 Months Ended
Feb. 29, 2016
Jan. 30, 2016
Oct. 31, 2015
Aug. 01, 2015
May. 02, 2015
Jan. 31, 2015
Nov. 01, 2014
Aug. 02, 2014
May. 03, 2014
Feb. 01, 2014
Nov. 02, 2013
Aug. 03, 2013
Jan. 30, 2016
Jan. 31, 2015
Feb. 01, 2014
Class of Stock [Line Items]                              
Common shares, par value (usd per share)   $ 0.18       $ 0.18             $ 0.18 $ 0.18  
Proceeds from issuance of common shares                         $ 5.0 $ 6.1 $ 9.3
Treasury stock held (shares)   7,746,591       6,933,684             7,746,591 6,933,684  
Treasury stock reissued                         205,661 309,305  
Dividends declared per share (usd per share)   $ 0.22 $ 0.22 $ 0.22 $ 0.22 $ 0.18 $ 0.18 $ 0.18 $ 0.18 $ 0.15 $ 0.15 $ 0.15 $ 0.88 $ 0.72 $ 0.6
Subsequent Event                              
Class of Stock [Line Items]                              
Dividends declared per share (usd per share) $ 0.26                            
Share Repurchase Program 2016                              
Class of Stock [Line Items]                              
Amount authorized $ 750.0