Shareholders' Equity (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended						6 Months Ended
	Mar. 31, 2012	Apr. 02, 2011	Mar. 31, 2012	Apr. 02, 2011	Mar. 31, 2012 Class A Common Stock [Member]	Mar. 31, 2012 Class B Common Stock [Member]	Mar. 31, 2012 Common Stock [Member]	Oct. 01, 2011 Common Stock [Member]	Mar. 31, 2012 Additional Paid-In Capital [Member]	Mar. 31, 2012 Retained Earnings [Member]	Mar. 31, 2012 Treasury Stock [Member]	Mar. 31, 2012 Treasury Stock [Member] Class A Common Stock [Member]	Mar. 31, 2012 Treasury Stock [Member] Class B Common Stock [Member]	Mar. 31, 2012 Stock Employee Compensation Trust (Sect) [Member]	Mar. 31, 2012 Stock Employee Compensation Trust (Sect) [Member] Class B Common Stock [Member]	Mar. 31, 2012 Accumulated Other Comprehensive (Loss) Income [Member]
Shareholders' Equity [Line Items]
Beginning of period			$ 1,191,891				$ 51,280	$ 51,280	$ 412,370	$ 1,016,754	$ (74,479)			$ (13,090)		$ (200,944)
Beginning of period, Shares					43,534,575	7,745,138						(2,393,039)	(3,305,971)		(395,470)
Conversion of Class B to Class A, Shares					13,261	(13,261)
Equity-based compensation expense									4,790
Issuance of treasury shares at more than cost									817		618
Adjustment to market - SECT									4,292					(3,925)
Net earnings	35,421	30,615	71,794	64,022						71,794
Purchase of treasury shares											(831)			(1,176)
End of Period, Shares					43,547,836	7,731,877						(2,297,255)	(3,305,971)		(423,037)
Issuance of treasury shares, Shares												115,915	0
Purchase of treasury shares, Shares												(20,131)	0		(27,567)
Other Comprehensive Income (Loss), Net of Tax	18,426	22,651	12,871	19,556												12,871
TOTAL SHAREHOLDERS' EQUITY, Shares					41,250,581	4,002,869
End of period	$ 1,281,141		$ 1,281,141				$ 51,280	$ 51,280	$ 422,269	$ 1,088,548	$ (74,692)			$ (18,191)		$ (188,073)