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Details of Selected Consolidated Balance Sheet Captions (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts Receivable, Gross, Current $ 233,128 $ 226,936
Less: allowance for doubtful accounts (10,865) (11,056)
Net accounts receivable 222,263 215,880
Schedule of Other Current Assets [Abstract]    
Deferred gas cost 65,714 45,184
Prepaid expenses 32,163 21,489
Taxes receivable 0 5,456
Materials and supplies 4,472 5,825
Assets from risk management activities current 2,436 3,029
Other 1,536 7,102
Total other current assets 106,321 88,085
Public Utilities, Property, Plant and Equipment [Abstract]    
Production plant 66 66
Storage plant 369,510 353,523
Transmission plant 2,521,671 2,232,927
Distribution plant 7,306,021 6,598,990
General plant 765,662 732,606
Intangible plant 38,980 40,515
Property, plant and equipment 11,001,910 9,958,627
Construction in progress 299,394 183,879
Total property, plant and equipment and construction in progress 11,301,304 10,142,506
Less accumulated depreciation and amortization (2,042,122) (1,873,900)
Net property, plant and equipment [1] 9,259,182 8,268,606
Plant acquisition adjustments (64,100) (59,800)
Goodwill [Line Items]    
Goodwill, Beginning Balance [2] 726,962  
Goodwill, Transfers 2,711  
Goodwill, Other Changes [3] 459  
Goodwill, Ending Balance 730,132  
Schedule of Other Noncurrent Assets [Abstract]    
Marketable securities 88,409 72,701
Regulatory assets 110,977 214,890
Assets from risk management activities noncurrent 803 1,822
Other 20,447 15,606
Total 220,636 305,019
Schedule of Accounts Payable and Accrued Liabilities [Abstract]    
Trade accounts payable 143,422 114,361
Accrued gas payable 50,253 47,107
Accrued liabilities 39,375 35,017
Total 233,050 196,485
Schedule of Other Current Liabilities [Abstract]    
Customer deposits 54,627 81,219
Accrued employee costs 46,653 47,058
Deferred gas costs 15,559 20,180
Accrued interest 39,624 34,863
Liabilities from risk management activities current 322 56,771 [4]
Taxes payable 116,291 104,145
Pension and postretirement obligations 18,411 36,606
Regulatory cost of removal accrual 35,910 52,610
Other 5,251 5,633
Total 332,648 439,085
Schedule of Other Noncurrent Liabilities [Abstract]    
Customer advances for construction 9,309 9,850
Regulatory liabilities 5,257 4,152
Asset retirement obligation 12,827 13,404
Liabilities from risk management activities noncurrent 112,076 184,048 [4]
Other 36,266 33,920
Total 175,735 245,374
Distribution Segment [Member]    
Public Utilities, Property, Plant and Equipment [Abstract]    
Net property, plant and equipment 6,849,517 6,208,465
Goodwill [Line Items]    
Goodwill, Beginning Balance 583,950  
Goodwill, Transfers 2,711  
Goodwill, Other Changes [3] 419  
Goodwill, Ending Balance 587,080  
Pipeline and Storage Segment [Member]    
Public Utilities, Property, Plant and Equipment [Abstract]    
Net property, plant and equipment 2,409,665 2,060,141
Goodwill [Line Items]    
Goodwill, Beginning Balance 143,012  
Goodwill, Transfers 0  
Goodwill, Other Changes [3] 40  
Goodwill, Ending Balance 143,052  
Natural Gas Marketing Segment [Member]    
Public Utilities, Property, Plant and Equipment [Abstract]    
Net property, plant and equipment 0 0
Goodwill [Line Items]    
Disposal Group, Including Discontinued Operation, Goodwill   16,400
Goodwill, Written off Related to Sale of Business Unit 13,700  
Trade Accounts Receivable [Member] | Billed Revenues [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts Receivable, Gross, Current 135,091 120,128
Trade Accounts Receivable [Member] | Unbilled Revenues [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts Receivable, Gross, Current 73,143 67,396
Other Accounts Receivable [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts Receivable, Gross, Current $ 24,894 $ 39,412
[1] Net property, plant and equipment includes plant acquisition adjustments of $(64.1) million and $(59.8) million at September 30, 2017 and 2016.
[2] Our discontinued natural gas marketing segment had $16.4 million of goodwill at September 30, 2016. Of this amount, $13.7 million was written off in connection with the sale and the remaining $2.7 million was reallocated to the distribution segment.
[3] We annually adjust certain deferred taxes recorded in connection with acquisitions completed in fiscal 2001 and fiscal 2004, which resulted in an increase to goodwill and net deferred tax liabilities of $0.5 million for fiscal 2017.
[4] Includes $25.7 million of cash held on deposit to collateralize certain distribution financial instruments, which were used to offset current and noncurrent risk management liabilities at September 30, 2016.