Pension and Savings Plans (Details) (USD $)	3 Months Ended
	Nov. 19, 2011	Nov. 20, 2010
Net periodic pension expense
Interest cost	$ 2,819,000	$ 2,678,000
Expected return on plan assets	(2,704,000)	(2,181,000)
Amortization of net loss	2,260,000	2,653,000
Net periodic pension expense	2,375,000	3,150,000
Pension and Savings Plans (Textuals) [Abstract]
Annual contributions by the Company to pension plans	1,300,000
Expected contributions to the plan during the remainder of fiscal 2011	$ 5,400,000