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Property, equipment, and right-of-use assets - Narrative (Details) - USD ($) | 12 Months Ended
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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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