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BUSINESS COMBINATIONS - Motive Merger (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 02, 2017 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2016
Business Combinations |  |  |  |  |  |  |  |  |  |  |  |
Payment to acquire business, net |  |  |  |  |  |  |  |  |  | $ 47,886 | $ 70,416 |
Operating revenue |  | $ 696,825 | $ 648,872 | $ 577,484 | $ 564,087 | $ 532,304 | $ 498,564 | $ 405,283 | $ 368,590 | 2,487,268 | 1,804,741 | $ 1,624,232
Net loss |  | (2,453) | $ 8,008 | $ 11,879 | $ (500,106) | 22,532 | $ 21,799 | $ 48,818 | $ 35,063 | (482,672) | 128,212 | 56,828
Fair value of assets acquired |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  | 64,777 |  |  |  | 51,705 |  |  |  | 64,777 | 51,705 | $ 4,718
Fair value of liabilities assumed |  |  |  |  |  |  |  |  |  |  |  |
Contingent earnout liability |  | 11,160 |  |  |  | 14,879 |  |  |  | $ 11,160 | 14,879 |
Estimated useful lives (in years) |  |  |  |  |  |  |  |  |  | 15 years |  |
MOTIVE Merger |  |  |  |  |  |  |  |  |  |  |  |
Business Combinations |  |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  |  | $ 12,900 | 3,300 |
Net loss |  |  |  |  |  |  |  |  |  | 20,100 | 2,200 |
Future potential earnout payments | $ 25,000 |  |  |  |  |  |  |  |  |  |  |
Cash placed in escrow | $ 9,400 |  |  |  |  |  |  |  |  |  |  |
Percentage of escrow to be released to seller on each of twelve and eighteenth month anniversaries | 50.00% |  |  |  |  |  |  |  |  |  |  |
Purchase Price |  |  |  |  |  |  |  |  |  |  |  |
Cash consideration | $ 74,275 |  |  |  |  |  |  |  |  |  |  |
Long-term contingent earnout liability (Other noncurrent liabilities) | 14,509 |  |  |  |  |  |  |  |  |  |  |
Total cash consideration given | 88,784 |  |  |  |  |  |  |  |  |  |  |
Fair value of assets acquired |  |  |  |  |  |  |  |  |  |  |  |
Current assets | 4,425 |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment | 300 |  |  |  |  |  |  |  |  |  |  |
Intangible assets, net | 51,000 |  |  |  |  |  |  |  |  |  |  |
Goodwill | 46,987 |  |  |  |  |  |  |  |  |  |  |
Total assets acquired | 102,712 |  |  |  |  |  |  |  |  |  |  |
Fair value of liabilities assumed |  |  |  |  |  |  |  |  |  |  |  |
Current liabilities | 25 |  |  |  |  |  |  |  |  |  |  |
Deferred income taxes | 13,903 |  |  |  |  |  |  |  |  |  |  |
Total liabilities acquired | 13,928 |  |  |  |  |  |  |  |  |  |  |
Fair value of total assets acquired and liabilities assumed | $ 88,784 |  |  |  |  |  |  |  |  |  |  |
Contingent consideration paid |  |  |  |  |  |  |  |  |  | 10,600 |  |
Change in fair value of contingent consideration |  |  |  |  |  |  |  |  |  | 6,900 | 400 |
Estimated useful lives (in years) | 15 years |  |  |  |  |  |  |  |  |  |  |
MOTIVE Merger | (Level 3) |  |  |  |  |  |  |  |  |  |  |  |
Fair value of liabilities assumed |  |  |  |  |  |  |  |  |  |  |  |
Contingent earnout liability |  | $ 11,200 |  |  |  | 14,900 |  |  |  | $ 11,200 | 14,900 |
MOTIVE Merger | General and Administrative |  |  |  |  |  |  |  |  |  |  |  |
Business Combinations |  |  |  |  |  |  |  |  |  |  |  |
Business acquisition transaction cost |  |  |  |  |  | $ 3,200 |  |  |  |  | $ 3,200 |

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