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Property and equipment and right-of-use assets - Narrative (Details) - USD ($) | 9 Months Ended
--- | ---
Jun. 30, 2025 | Jun. 30, 2024
Property, equipment, and right-of-use assets |  |
Balance of equipment value paid in cash | $ 10,530,000 | $ 6,852,000
Rental equipment |  |
Property, equipment, and right-of-use assets |  |
Rental equipment transferred from inventory | 26,897,000 | 24,467,000
Accounts payable | 1,756,000 | 0
Balance of equipment value paid in cash | 8,949,000 | 5,056,000
Rental equipment | Equipment loans |  |
Property, equipment, and right-of-use assets |  |
Principal amount of debt | $ 16,192,000 | $ 19,411,000

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