Shareholders' Equity (Details) - USD ($) $ / shares in Units, $ in Thousands			6 Months Ended
	Apr. 05, 2018	Mar. 26, 2018	Mar. 03, 2018	Mar. 04, 2017	Jan. 09, 2018	Sep. 02, 2017
Components Of Shareholders Equity [Line Items]
Regular dividends cash paid			$ 59,873	$ 51,010
Purchase of treasury stock			$ 21,728
Shares repurchased by the company for associates' tax withholding liability associated with share-based compensation			53,000
Preferred stock, shares authorized			5,000,000			5,000,000
Preferred stock, shares issued			0			0
Preferred stock, shares outstanding			0			0
Subsequent Event [Member]
Components Of Shareholders Equity [Line Items]
Dividends declared date	Apr. 05, 2018
Dividends payable per share	$ 0.58
Dividend payable date	May 01, 2018
Dividends record date	Apr. 17, 2018
Dividend payable amount		$ 32,760
Regular Dividends [Member]
Components Of Shareholders Equity [Line Items]
Cash dividends paid per common share			$ 1.06	$ 0.90
Regular dividends cash paid			$ 59,873	$ 51,010
Class A Common Stock [Member]
Components Of Shareholders Equity [Line Items]
Maximum number of shares that can be repurchased			2,600,000
Class A Treasury Stock [Member]
Components Of Shareholders Equity [Line Items]
Common stock shares repurchased			249,000
Purchase of treasury stock			$ 21,728
Number of shares authorized for repurchase					2,000,000