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Property, equipment, and right-of-use assets - Narrative (Details) - USD ($)	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024
Property, equipment, and right-of-use assets
Balance of equipment value paid in cash	$ 12,354,000	$ 10,313,000
Rental equipment
Property, equipment, and right-of-use assets
Rental equipment transferred from inventory	37,058,000	33,566,000
Balance of equipment value paid in cash	11,280,000	8,262,000
Rental equipment | Equipment loans
Property, equipment, and right-of-use assets
Principal amount of debt	23,828,000	25,304,000
Accounts payable	$ 1,950,000	$ 0

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