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Business Combinations (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Dec. 08, 2017 | Mar. 31, 2018 | Mar. 31, 2017 | Mar. 31, 2018 | Mar. 31, 2017 | Sep. 30, 2017
Business Combinations |  |  |  |  |  |
Payment to acquire business, net |  |  |  | $ 47,886 |  |
Operating revenue |  | $ 577,484 | $ 405,283 | 1,141,571 | $ 773,873 |
Net loss |  | 11,879 | $ 48,818 | (488,227) | 83,881 |
Fair value of assets acquired |  |  |  |  |  |
Goodwill |  | 69,496 |  | $ 69,496 |  | $ 51,705
Minimum | Restricted stock |  |  |  |  |  |
Business Combinations |  |  |  |  |  |
Vesting period |  |  |  | 3 years |  |
Maximum | Restricted stock |  |  |  |  |  |
Business Combinations |  |  |  |  |  |
Vesting period |  |  |  | 6 years |  |
MagVAR Acquisition |  |  |  |  |  |
Business Combinations |  |  |  |  |  |
Payment to acquire business, net | $ 47,900 |  |  |  |  |
Period escrow to be released to seller | 12 months |  |  |  |  |
Operating revenue |  |  |  | $ 3,900 |  |
Net loss |  |  |  | 1,100 |  |
Purchase Price |  |  |  |  |  |
Cash consideration | $ 48,485 |  |  |  |  |
Fair value of assets acquired |  |  |  |  |  |
Current assets | 2,286 |  |  |  |  |
Property, plant and equipment | 13 |  |  |  |  |
Intangible assets, net of amortization | 28,700 |  |  |  |  |
Goodwill | 17,791 |  |  |  |  |
Total assets acquired | 48,790 |  |  |  |  |
Fair value of liabilities assumed |  |  |  |  |  |
Current liabilities | 305 |  |  |  |  |
Fair value of total assets and liabilities acquired | 48,485 |  |  |  |  |
Pro forma financial information: |  |  |  |  |  |
After-tax transaction costs excluded from pro forma earnings |  |  |  | 600 |  |
Revenues |  |  |  | 1,145,258 | 778,628 |
Net income (loss) |  |  |  | 488,439 | $ (83,287) |
MagVAR Acquisition | Prepaid expenses and other |  |  |  |  |  |
Business Combinations |  |  |  |  |  |
Restricted cash | $ 6,000 |  |  |  |  |
MagVAR Acquisition | Restricted stock |  |  |  |  |  |
Business Combinations |  |  |  |  |  |
Restricted stock awards issued | 213,904 |  |  |  |  |
Vesting period | 3 years |  |  |  |  |
MagVAR Acquisition | General and Administrative |  |  |  |  |  |
Business Combinations |  |  |  |  |  |
Business acquisition transaction cost |  | $ 1,200 |  | $ 1,200 |  |
MagVAR Acquisition | Minimum |  |  |  |  |  |
Business Combinations |  |  |  |  |  |
Estimated useful lives (in years) | 5 years |  |  |  |  |
MagVAR Acquisition | Maximum |  |  |  |  |  |
Business Combinations |  |  |  |  |  |
Estimated useful lives (in years) | 20 years |  |  |  |  |

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