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Goodwill - Narrative (Details) - USD ($)	12 Months Ended
Goodwill - Narrative (Details) - USD ($)	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
Segment Reporting Information [Line Items]
Accumulated goodwill impairment loss	$ 168,600,000	$ 168,600,000
Impairment of long-lived assets	0	0	$ 0
Software Solutions
Segment Reporting Information [Line Items]
Increase in goodwill balance	$ 5,100,000
GovDeals \| Sierra Acquisition
Segment Reporting Information [Line Items]
Increase in goodwill balance		$ 7,900,000