Shareholders' Equity (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands			9 Months Ended
	Jul. 07, 2017	Jun. 30, 2017	Jun. 03, 2017	May 28, 2016
Components Of Shareholders Equity [Line Items]
Regular dividends cash paid			$ 76,632	$ 79,351
Purchase of treasury stock			$ 3,080
Subsequent Event [Member]
Components Of Shareholders Equity [Line Items]
Dividends declared date	Jul. 07, 2017
Dividends payable per share	$ 0.45
Dividend payable date	Aug. 01, 2017
Dividends record date	Jul. 18, 2017
Dividend payable amount		$ 25,629
Regular Dividends [Member]
Components Of Shareholders Equity [Line Items]
Cash dividends paid per common share			$ 1.35	$ 1.29
Regular dividends cash paid			$ 76,632	$ 79,351
Class A Treasury Stock [Member]
Components Of Shareholders Equity [Line Items]
Class A common stock shares repurchased			42
Purchase of treasury stock			$ 3,080