Pension And Other Postretirement Benefits Disclosure: Schedule of Net Benefit Costs (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jan. 26, 2013	Jan. 28, 2012	Jan. 26, 2013	Jan. 28, 2012
Defined Benefit Plan, Service Cost	$ 818	$ 664	$ 1,636	$ 1,328
Defined Benefit Plan, Interest Cost	618	678	1,236	1,356
Defined Benefit Plan, Expected Return on Plan Assets	(694)	(631)	(1,388)	(1,262)
Defined Benefit Plan Amortization Of (Gains) Losses	529	330	1,058	660
Defined Benefit Plan, Amortization of Net Prior Service Cost (Credit)	2	2	4	4
Defined Benefit Plan, Net Periodic Benefit Cost	$ 1,273	$ 1,043	$ 2,546	$ 2,086