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Retirement and Post-Retirement Employee Benefit Plans Fair Value of Plan Assets (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Pension Plans, Defined Benefit [Member]
   
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets at beginning of year $ 343,144 $ 280,204
Actual return on plan assets 52,496 48,656
Employer contributions 32,745 46,534
Benefits paid (25,073) (24,553)
Divestitures (6,425) (7,697)
Fair value of plan assets at end of year 396,887 343,144
Other Postretirement Benefit Plans, Defined Benefit [Member]
   
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets at beginning of year 77,072 53,065
Actual return on plan assets 13,432 12,912
Employer contributions 26,552 22,139
Plan participants' contributions 3,815 3,649
Benefits paid (14,458) (13,197)
Divestitures 0 (1,496)
Fair value of plan assets at end of year 106,413 77,072
Supplemental Executive Retirement Plans, Defined Benefit [Member]
   
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets at beginning of year 0 0
Employer contributions 14,449 4,638
Benefits paid (4,375) (4,638)
Settlements (10,074) 0
Fair value of plan assets at end of year $ 0 $ 0