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COMMITMENTS AND CONTINGENCIES (Details) $ in Thousands	12 Months Ended
	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)
Purchase obligations
Purchase orders outstanding for equipment, parts and supplies	$ 110,400
Fiscal Year
2019	9,113
2020	6,670
2021	4,357
2022	3,985
2023	3,721
Thereafter	5,095
Total	32,941
Commitments and Contingencies
Total rent expense	13,700	$ 14,000	$ 13,500
Contingencies
Contingent gains recognized in consolidated financial statements	$ 0
Office space near downtown Tulsa, Oklahoma
Contingencies
Number of renewal options	2
Lease renewal term	5 years

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