Interim Pension and Other Postretirement Benefits (Details) (USD $)	0 Months Ended	3 Months Ended		6 Months Ended
	Oct. 02, 2013	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2015	Mar. 31, 2014
Pension Benefits [Member]
Components of net periodic pension cost [Abstract]
Service Cost		$ 5,051,000	$ 4,738,000	$ 10,102,000	$ 9,476,000
Interest Cost		6,698,000	6,824,000	13,397,000	13,648,000
Expected return on assets		(6,437,000)	(5,900,000)	(12,873,000)	(11,801,000)
Amortization of transition (asset)/obligation		0	0	0	0
Amortization of prior service (credit)/cost		(47,000)	(34,000)	(96,000)	(68,000)
Amortization of actuarial (gain) loss		3,916,000	3,930,000	7,833,000	7,862,000
Settlement loss	4,500,000			0	4,539,000
Net periodic pension cost		9,181,000	9,558,000	18,363,000	23,656,000
Defined Benefit Plan Weighted Average Assumptions Used In Calculating Net Periodic Benefit Cost Abstract
Discount Rate		4.43%	4.95%	4.43%	4.95%
Rate of compensation increase		3.50%	3.50%	3.50%	3.50%
Expected return on plan assets		7.25%	7.25%	7.25%	7.25%
Current Year Benefit Plan Contributions [Abstract]
Benefit Payment	16,800,000
Pension Benefits [Member] | Minimum [Member]
Current Year Benefit Plan Contributions [Abstract]
Defined Benefit Plan, Expected Contributions in Current Fiscal Year				30,000,000
Pension Benefits [Member] | Maximum [Member]
Current Year Benefit Plan Contributions [Abstract]
Defined Benefit Plan, Expected Contributions in Current Fiscal Year				35,000,000
Other Benefits [Member]
Components of net periodic pension cost [Abstract]
Service Cost		3,896,000	4,196,000	7,792,000	8,392,000
Interest Cost		3,597,000	3,988,000	7,193,000	7,976,000
Expected return on assets		(1,608,000)	(1,292,000)	(3,216,000)	(2,584,000)
Amortization of transition (asset)/obligation		68,000	68,000	136,000	136,000
Amortization of prior service (credit)/cost		(411,000)	(362,000)	(822,000)	(725,000)
Amortization of actuarial (gain) loss		0	158,000	0	316,000
Settlement loss				0	0
Net periodic pension cost		5,542,000	6,756,000	11,083,000	13,511,000
Defined Benefit Plan Weighted Average Assumptions Used In Calculating Net Periodic Benefit Cost Abstract
Discount Rate		4.43%	4.95%	4.43%	4.95%
Expected return on plan assets		4.60%	4.60%	4.60%	4.60%
Current Year Benefit Plan Contributions [Abstract]
Contributions Actual				10,200,000
Other Benefits [Member] | Minimum [Member]
Current Year Benefit Plan Contributions [Abstract]
Defined Benefit Plan, Expected Contributions in Current Fiscal Year				20,000,000
Other Benefits [Member] | Maximum [Member]
Current Year Benefit Plan Contributions [Abstract]
Defined Benefit Plan, Expected Contributions in Current Fiscal Year				$ 25,000,000