Regulatory Assets and Liabilities and Regulatory Matters (Tables)

12 Months Ended

Sep. 30, 2018

Regulated Operations [Abstract]

Schedule of Regulatory Assets

The following regulatory assets and liabilities are included in our Consolidated Balance Sheets at September 30:

	2018		2017
Regulatory assets:
Income taxes recoverable	$	110,129	$	121,421
Underfunded pension and postretirement plans	87,106		141,310
Environmental costs	58,836		61,566
Deferred fuel and power costs	—		7,685
Removal costs, net	32,025		30,996
Other	12,906		5,951
Total regulatory assets	$	301,002	$	368,929
Regulatory liabilities:
Postretirement benefits overcollections	$	17,781	$	17,493
Deferred fuel and power refunds	36,723		10,621
State income tax benefits — distribution system repairs	22,611		18,430
PAPUC temporary rates order (a)	24,430		—
Excess federal deferred income taxes (b)	285,221		—
Other	3,409		2,686
Total regulatory liabilities	$	390,175	$	49,230

Schedule of Regulatory Liabilities

The following regulatory assets and liabilities are included in our Consolidated Balance Sheets at September 30:

	2018		2017
Regulatory assets:
Income taxes recoverable	$	110,129	$	121,421
Underfunded pension and postretirement plans	87,106		141,310
Environmental costs	58,836		61,566
Deferred fuel and power costs	—		7,685
Removal costs, net	32,025		30,996
Other	12,906		5,951
Total regulatory assets	$	301,002	$	368,929
Regulatory liabilities:
Postretirement benefits overcollections	$	17,781	$	17,493
Deferred fuel and power refunds	36,723		10,621
State income tax benefits — distribution system repairs	22,611		18,430
PAPUC temporary rates order (a)	24,430		—
Excess federal deferred income taxes (b)	285,221		—
Other	3,409		2,686
Total regulatory liabilities	$	390,175	$	49,230