Retiree Benefits (Textuals) (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Jan. 27, 2017	Jan. 29, 2016	Oct. 30, 2015
Pension contributions	$ 1,457	$ 1,418
Estimated employer contributions to defined benefit plan in current fiscal year	15,000
Other Postretirement Benefit Plan [Member]
Contractual termination benefits	0	0
Pension Plan
Contractual termination benefits	$ 0	9,600
Underground | Pension Plan
Contractual termination benefits		$ 9,600	$ 2,600