Shareholders' Equity (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands		3 Months Ended		6 Months Ended
	Mar. 26, 2019	Mar. 02, 2019	Mar. 03, 2018	Mar. 02, 2019	Mar. 03, 2018
Components Of Shareholders Equity [Line Items]
Purchase of treasury stock			$ 17,710		$ 21,728
Shares repurchased			198		249
Maximum number of shares that can be repurchased		1,157		1,157
Treasury stock reissued to fund plan, shares		20	17	33	30
Subsequent Event [Member]
Components Of Shareholders Equity [Line Items]
Dividends declared date	Mar. 26, 2019
Dividends payable per share	$ 0.63
Dividend payable date	Apr. 23, 2019
Dividends record date	Apr. 09, 2019
Dividend payable amount	$ 34,757
Class A Common Stock [Member]
Components Of Shareholders Equity [Line Items]
Common stock shares repurchased		275		315
Purchase of treasury stock		$ 20,898		$ 24,098
Treasury stock repurchased, and treasury stock repurchased and retired, shares		275		1,053
Treasury stock repurchased, and treasury stock repurchased and retired, amount		$ 20,898
Treasury Stock [Member]
Components Of Shareholders Equity [Line Items]
Purchase of treasury stock		$ 20,898	$ 17,710	$ 24,098	$ 21,728
Treasury Stock [Member] | Class A Common Stock [Member]
Components Of Shareholders Equity [Line Items]
Treasury stock repurchased, and treasury stock repurchased and retired, amount				$ 84,425