Pension and Savings Plans (Details) (USD $)	3 Months Ended		9 Months Ended
	May 07, 2011	May 08, 2010	May 07, 2011	May 08, 2010
Components of net periodic pension expense related to the Company's pension plans
Interest cost	$ 2,570,000	$ 2,611,000	$ 7,709,000	$ 7,833,000
Expected return on plan assets	(2,152,000)	(2,087,000)	(6,456,000)	(6,261,000)
Amortization of net loss	2,170,000	1,877,000	6,511,000	5,631,000
Net periodic pension expense	2,588,000	2,401,000	7,764,000	7,203,000
Pension and Savings Plans (Textuals) [Abstract]
Annual contributions by the Company to pension plans			4,500,000
Expected contributions to the plan during the remainder of fiscal 2011	$ 1,300,000		$ 1,300,000