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BUSINESS SEGMENTS AND GEOGRAPHIC INFORMATION - Summary of Financial Information of Reportable Segments (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
Segment Reporting Information [Line Items]
Revenues	$ 1,218,568	$ 1,773,927	$ 2,798,490
Segment operating income (loss)	(428,549)	(620,187)	20,582
Depreciation and amortization	419,726	481,885	562,803
Intersegment
Segment Reporting Information [Line Items]
Revenues	(35,416)	(36,901)	0
Segment operating income (loss)	(1,580)
Operating Segments
Segment Reporting Information [Line Items]
Revenues	1,218,568	1,773,927	2,798,490
Segment operating income (loss)	(303,494)	(544,389)	109,233
Depreciation and amortization	406,411	468,492	551,465
North America Solutions
Segment Reporting Information [Line Items]
Revenues	1,026,364	1,474,380	2,426,191
North America Solutions | Intersegment
Segment Reporting Information [Line Items]
Revenues	0	0	0
North America Solutions | Operating Segments
Segment Reporting Information [Line Items]
Revenues	1,026,364	1,474,380	2,426,191
Segment operating income (loss)	(287,176)	(393,902)	80,898
Depreciation and amortization	392,415	438,039	504,466
Offshore Gulf of Mexico
Segment Reporting Information [Line Items]
Revenues	126,399	143,149	147,635
Offshore Gulf of Mexico | Intersegment
Segment Reporting Information [Line Items]
Revenues	0	0	0
Offshore Gulf of Mexico | Operating Segments
Segment Reporting Information [Line Items]
Revenues	126,399	143,149	147,635
Segment operating income (loss)	15,969	7,478	19,594
Depreciation and amortization	10,557	11,681	10,010
International Solutions
Segment Reporting Information [Line Items]
Revenues	57,917	144,185	211,731
International Solutions | Intersegment
Segment Reporting Information [Line Items]
Revenues	0	0	0
International Solutions | Operating Segments
Segment Reporting Information [Line Items]
Revenues	57,917	144,185	211,731
Segment operating income (loss)	(21,003)	(162,368)	5,366
Depreciation and amortization	2,013	17,531	35,466
Other
Segment Reporting Information [Line Items]
Revenues	7,888	12,213	12,933
Other | Intersegment
Segment Reporting Information [Line Items]
Revenues	(35,416)	(36,901)	0
Other | Operating Segments
Segment Reporting Information [Line Items]
Revenues	43,304	49,114	12,933
Segment operating income (loss)	(9,704)	4,403	3,375
Depreciation and amortization	$ 1,426	$ 1,241	$ 1,523

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