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BUSINESS SEGMENTS AND GEOGRAPHIC INFORMATION - Summary of Financial Information of Reportable Segments (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Mar. 31, 2020 | Mar. 31, 2019
Segment Reporting Information [Line Items] |  |  |  |
Revenues | $ 633,639 | $ 720,868 | $ 1,248,296 | $ 1,461,466
Segment Operating Income (Loss) | (518,541) | 95,146 | (487,173) | 149,435
U.S. Land |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 530,664 | 617,533 | 1,039,492 | 1,236,958
Offshore |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 33,079 | 34,583 | 73,334 | 71,493
International Land |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 51,250 | 50,808 | 97,712 | 117,095
H&P Technologies |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 15,297 | 14,729 | 31,150 | 29,465
Other |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 3,349 | 3,215 | 6,608 | 6,455
Operating Segment |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 633,639 | 720,868 | 1,248,296 | 1,461,466
Segment Operating Income (Loss) | (498,079) | 111,870 | (437,578) | 196,545
Operating Segment | U.S. Land |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 530,664 | 617,533 | 1,039,492 | 1,236,958
Segment Operating Income (Loss) | (309,093) | 102,015 | (252,403) | 177,928
Operating Segment | Offshore |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 33,079 | 34,583 | 73,334 | 71,493
Segment Operating Income (Loss) | (3,319) | 4,531 | 3,009 | 11,699
Operating Segment | International Land |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 51,250 | 50,808 | 97,712 | 117,095
Segment Operating Income (Loss) | (152,469) | 7,968 | (149,354) | 14,597
Operating Segment | H&P Technologies |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 17,709 | 14,729 | 36,261 | 29,465
Segment Operating Income (Loss) | (33,574) | (3,808) | (38,125) | (10,397)
Operating Segment | Other |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 13,998 | 3,215 | 25,153 | 6,455
Segment Operating Income (Loss) | 376 | 1,164 | (705) | 2,718
Intersegment |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | (13,061) | 0 | (23,656) | 0
Segment Operating Income (Loss) | 0 | 0 | 0 | 0
Intersegment | U.S. Land |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 0 | 0 | 0 | 0
Intersegment | Offshore |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 0 | 0 | 0 | 0
Intersegment | International Land |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 0 | 0 | 0 | 0
Intersegment | H&P Technologies |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 2,412 | 0 | 5,111 | 0
Intersegment | Other |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | $ 10,649 | $ 0 | $ 18,545 | $ 0

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