Pension and Savings Plans (Details) (USD $)	3 Months Ended		9 Months Ended
	May 05, 2012	May 07, 2011	May 05, 2012	May 07, 2011
Net periodic pension expense
Interest cost	$ 2,819,000	$ 2,570,000	$ 8,456,000	$ 7,709,000
Expected return on plan assets	(2,704,000)	(2,152,000)	(8,112,000)	(6,456,000)
Amortization of net loss	2,260,000	2,170,000	6,781,000	6,511,000
Net periodic pension expense	2,375,000	2,588,000	7,125,000	7,764,000
Pension and Savings Plans (Textual) [Abstract]
Annual contributions by the Company to pension plans			4,600,000
Expected contributions to the plan during the remainder of fiscal 2012	$ 10,700,000		$ 10,700,000