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SCHEDULE II (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2011
DOUBTFUL ACCOUNTS [Member]
      
CHANGES IN RESERVES [Roll Forward]      
BALANCE AT BEGINNING OF PERIOD $ 7,705 $ 10,073 $ 10,295
ADDITIONS TO INCOME 5,584 6,011 7,242
CHARGED TO OTHER ACCOUNTS 8,234 [1] 10,145 [1] 11,340 [1]
DEDUCTIONS FROM RESERVES 13,477 [2] 18,524 [2] 18,804 [2]
BALANCE AT END OF PERIOD 8,046 7,705 10,073
MISCELLANEOUS: Injuries and property damage [Member]
      
CHANGES IN RESERVES [Roll Forward]      
BALANCE AT BEGINNING OF PERIOD 4,540 3,603 3,228
ADDITIONS TO INCOME 1,934 3,150 2,416
CHARGED TO OTHER ACCOUNTS 0 0 0
DEDUCTIONS FROM RESERVES 2,135 [3] 2,213 [3] 2,041 [3]
BALANCE AT END OF PERIOD 4,339 4,540 3,603
MISCELLANEOUS: deferred compensation [Member]
      
CHANGES IN RESERVES [Roll Forward]      
BALANCE AT BEGINNING OF PERIOD 14,205 13,474 12,571
ADDITIONS TO INCOME 1,781 1,756 1,893
CHARGED TO OTHER ACCOUNTS 0 0 0
DEDUCTIONS FROM RESERVES 1,306 1,025 990
BALANCE AT END OF PERIOD 14,680 14,205 13,474
MISCELLANEOUS: group medical claims incurred but not reported [Member]
      
CHANGES IN RESERVES [Roll Forward]      
BALANCE AT BEGINNING OF PERIOD 1,560 1,300 1,450
ADDITIONS TO INCOME 17,205 15,381 14,171
CHARGED TO OTHER ACCOUNTS 0 0 0
DEDUCTIONS FROM RESERVES 16,116 [3] 15,121 [3] 14,321 [3]
BALANCE AT END OF PERIOD 2,649 1,560 1,300
Total MISCELLANEOUS [Member]
      
CHANGES IN RESERVES [Roll Forward]      
BALANCE AT BEGINNING OF PERIOD 20,305 18,377 17,249
ADDITIONS TO INCOME 20,920 [4] 20,287 18,480
CHARGED TO OTHER ACCOUNTS 0 [4] 0 0
DEDUCTIONS FROM RESERVES 19,557 [4] 18,359 17,352
BALANCE AT END OF PERIOD $ 21,668 $ 20,305 $ 18,377
[1] Accounts reinstated, cash recoveries, etc.
[2] Accounts written off.
[3] Claims settled, less reimbursements from insurance companies.
[4] Totals for the year ended September 30, 2013 includes one month of MGE activity.