Retirement and Post-Retirement Employee Benefit Plans Net Periodic Cost (Details) (USD $)	0 Months Ended	12 Months Ended
	Apr. 02, 2013	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Pension Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost		$ 17,754,000	$ 15,084,000	$ 14,384,000
Interest cost		19,334,000	21,568,000	22,264,000
Expected return on assets		(22,955,000)	(21,474,000)	(24,817,000)
Amortization of prior service cost		(141,000)	(141,000)	(429,000)
Recognized actuarial loss		19,066,000	14,451,000	9,498,000
Curtailment loss		0	0	(40,000)
Net periodic cost		33,058,000	29,488,000	20,860,000
Other Postretirement Benefit Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost		18,800,000	16,353,000	14,403,000
Interest cost		12,964,000	13,861,000	12,813,000
Expected return on assets		(3,988,000)	(2,607,000)	(2,727,000)
Amortization of transition asset		1,081,000	1,511,000	1,511,000
Amortization of prior service cost		(1,450,000)	(1,450,000)	(1,450,000)
Recognized actuarial loss		4,196,000	2,648,000	347,000
Net periodic cost		31,603,000	30,316,000	24,897,000
Supplemental Executive Retirement Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost		3,039,000	2,108,000	2,768,000
Interest cost		4,755,000	5,142,000	5,825,000
Amortization of transition asset		0	0	0
Amortization of prior service cost		0	0	0
Recognized actuarial loss		2,918,000	2,118,000	2,239,000
Settlements	(3,200,000)	3,160,000	0	0
Net periodic cost		13,872,000	9,368,000	10,832,000
Effect on Net Periodic Cost Due To Discount Rate Change, Remaining Fiscal Year	$ 100,000