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Business Transactions (Details) hp in Thousands, $ in Thousands	1 Months Ended					3 Months Ended		9 Months Ended		15 Months Ended
	Jul. 31, 2021 USD ($) CompressorUnit	Jul. 30, 2021 USD ($)	Feb. 28, 2021 hp CompressorUnit	Jul. 31, 2020 USD ($)	Mar. 31, 2020 CompressorUnit hp	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($)
Transactions
Gain on disposition								$ 18,945	$ 12,475
Proceeds from sale								24,683	14,043
Disposed of by Sale | July 2021 Dispositions
Transactions
Number of compressors | CompressorUnit	575
Compressor units horsepower (horsepower)	100
Cash consideration received						$ 60,300		60,300
Gain on disposition						$ 13,000		13,000
Consideration receivable	$ 1,300
Disposed of by Sale | February 2021 Disposition
Transactions
Number of compressors | CompressorUnit			300
Compressor units horsepower (horsepower) | hp			40
Gain on disposition								6,000
Disposed of by Sale | July 2020 Disposition
Transactions
Disposal Group, Not Discontinued Operation, Name of Segment				Aftermarket Services
Cash consideration received				$ 9,500
Cash consideration received on first anniversary of closing		$ 3,000
Amount of consideration receivable as credit for purchases				$ 3,500
Cash received under supply agreement								$ 2,500		$ 3,200
Gain on disposition							$ 9,300		9,300
Disposed of by Sale | March 2020 Disposition
Transactions
Number of compressors | CompressorUnit					200
Compressor units horsepower (horsepower) | hp					35
Gain on disposition									$ 3,200
Turbocharger goods and services | July 2020 Disposition
Transactions
Term of supply agreement				2 years

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