Shareholders' Equity (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands		6 Months Ended
	Mar. 30, 2017	Mar. 04, 2017	Feb. 27, 2016
Components Of Shareholders Equity [Line Items]
Regular dividends cash paid		$ 51,010	$ 52,948
Purchase of treasury stock		$ 3,064
Subsequent Event [Member]
Components Of Shareholders Equity [Line Items]
Dividends declared date	Mar. 30, 2017
Dividends payable per share	$ 0.45
Dividend payable date	May 02, 2017
Dividends record date	Apr. 18, 2017
Dividend payable amount	$ 25,622
Regular Dividends [Member]
Components Of Shareholders Equity [Line Items]
Cash dividends paid per common share		$ 0.90	$ 0.86
Regular dividends cash paid		$ 51,010	$ 52,948
Class A Treasury Stock [Member]
Components Of Shareholders Equity [Line Items]
Class A common stock shares repurchased		42
Purchase of treasury stock		$ 3,064
Maximum number of shares that can be repurchased		1,444