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Segment and Geographic Information - Summary of Revenue and Profit Attributable to Our Operating Segments (Parenthetical) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2018
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |
Depreciation and amortization | $ 80,817 | $ 77,824 | $ 87,408
Unallocated |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |
Depreciation and amortization | 19,400 | 20,600 | 22,700
Software Products | Operating Segments |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |
Depreciation and amortization | 4,200 | 4,600 | 5,100
Professional Services | Operating Segments |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |
Depreciation and amortization | $ 1,100 | $ 1,400 | $ 1,600

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