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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)
$ in Thousands
 9 Months Ended
Jun. 30, 2021
Jun. 30, 2020
CASH FLOWS FROM OPERATING ACTIVITIES    
Net income $ 119,023 $ 130,300
Adjustments to reconcile net income to cash flows from operating activities    
Unrealized loss (gain) on derivative instruments 13,627 (21,827)
Other than temporary impairment 92,000 0
Depreciation and amortization 81,977 80,025
Amortization of acquired wholesale energy contracts 4,000 4,356
Allowance for equity used during construction (16,820) (12,328)
Allowance for doubtful accounts 15,288 1,657
Non cash lease expense 3,048 2,864
Deferred income taxes 4,816 27,014
Manufactured gas plant remediation costs (23,775) (6,629)
Equity in earnings, net of distributions received from equity investees and impairments (3,469) (4,985)
Cost of removal - asset retirement obligations (768) (183)
Contributions to postemployment benefit plans (2,347) (5,969)
Taxes related to stock-based compensation (149) 644
Changes in:    
Components of working capital (9,805) (17,397)
Other noncurrent assets 53,430 10,177
Other noncurrent liabilities 11,720 (4,936)
Cash flows from operating activities 341,796 182,783
Expenditures for:    
Cost of removal (37,922) (24,343)
Acquisition of assets, net of cash acquired of $5.1 million 0 (523,647)
Distribution from equity investees in excess of equity in earnings 733 1,411
Investments in equity investees (690) (1,491)
Cash flows used in investing activities (429,870) (890,966)
CASH FLOWS (USED IN) FROM FINANCING ACTIVITIES    
Proceeds from long-term debt 0 50,000
Payments of long-term debt (10,463) (11,947)
Proceeds from term loan 0 350,000
Payments of term loan 0 (212,900)
Proceeds from short-term debt, net 50,950 390,562
Proceeds from sale leaseback transaction - solar 17,673 42,927
Proceeds from sale leaseback transaction 0 4,000
Payments of common stock dividends (90,377) (86,709)
Proceeds from issuance of common stock - public equity offering 0 212,900
Cash settlement of equity forward agreement (2,823) 0
Proceeds from issuance of common stock - DRP 11,520 14,498
Tax withholding payments related to net settled stock compensation (1,819) (3,966)
Cash flows (used in) from financing activities (25,339) 749,365
Change in cash, cash equivalents and restricted cash (113,413) 41,182
Cash, cash equivalents and restricted cash at beginning of period 119,423 4,063
Cash, cash equivalents and restricted cash at end of period 6,010 45,245
CHANGES IN COMPONENTS OF WORKING CAPITAL    
Receivables (75,730) (3,019)
Inventories 42,639 42,566
Recovery of natural gas costs (19,208) (5,722)
Natural gas purchases payable 20,073 (55,594)
Natural gas purchases payable - related parties 72 1
Accounts payable and other 12,655 (13,084)
Prepaid expenses (3,624) 1,487
Prepaid and accrued taxes (7,236) (991)
Restricted broker margin accounts 25,308 11,900
Customers' credit balances and deposits (3,235) (7,060)
Other current assets (1,519) 12,119
Total (9,805) (17,397)
Cash paid for:    
Interest (net of amounts capitalized) 66,322 47,642
Income taxes 5,357 1,127
Accrued capital expenditures 36,988 20,814
Utility Plant    
Expenditures for:    
Payments to acquire PP&E (289,205) (213,667)
Solar Equipment    
Expenditures for:    
Payments to acquire PP&E (51,545) (110,968)
Storage and Transportation and other    
Expenditures for:    
Payments to acquire PP&E $ (51,241) $ (18,261)