Retirement Benefit Plans -Retirement Benefit Plan Liabilities (Details) - USD ($) $ in Thousands	Jan. 30, 2016	Jan. 31, 2015
Defined Benefit Plan Disclosure
Total	$ 5,667	$ 11,757
Long-term retirement benefit plan liabilities	4,471	5,060
Supplemental Employee Retirement Plans, Defined Benefit
Defined Benefit Plan Disclosure
Total	1,394	7,531
Less amount classified in accrued expenses	0	6,044
Other Postretirement Benefit Plans, Defined Benefit
Defined Benefit Plan Disclosure
Total	4,273	4,226
Less amount classified in accrued expenses	$ 1,196	$ 653