Shareholders' Equity (Details 3) $ / shares in Units, $ in Millions	12 Months Ended
	Feb. 03, 2018 USD ($) $ / shares shares
Shareholders Equity
Number of Shares	211,045
Performance shares
Shareholders Equity
Number of Shares	70,000
Average Market Price on Date of Grant (in dollars per share) | $ / shares	$ 56
Performance shares | Fiscal 2015
Shareholders Equity
Number of Shares	68,408
Average Market Price on Date of Grant (in dollars per share) | $ / shares	$ 58
Performance shares | Fiscal 2016
Shareholders Equity
Number of Shares	29,576
Average Market Price on Date of Grant (in dollars per share) | $ / shares	$ 76
Restricted share units
Shareholders Equity
Number of Shares	35,137
Average Market Price on Date of Grant (in dollars per share) | $ / shares	$ 59
Unrecognized compensation expense related to unvested share-based restricted stock awards and the unvested restricted share units (in dollars) | $	$ 7.6
Restricted share units | Fiscal 2016
Shareholders Equity
Number of Shares	30,319
Average Market Price on Date of Grant (in dollars per share) | $ / shares	$ 76
Restricted share units | Fiscal 2017
Shareholders Equity
Number of Shares	47,605
Average Market Price on Date of Grant (in dollars per share) | $ / shares	$ 56