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Nature of Business and Summary of Significant Accounting Policies - Additional Information (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017
Property, Plant and Equipment [Line Items] |  |  |
Other investments | $ 1,643 | $ 1,697 |
Depreciation and amortization, property and equipment | 24,200 | 22,600 | $ 23,000
Foreign exchange gains (losses) | 0 | 400 | 1,100
Advertising and promotion costs | $ 3,600 | $ 4,100 | $ 3,100
Minimum |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Stock option awards vesting period | 3 years |  |
Maximum |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Stock option awards vesting period | 4 years |  |
Software Development | Minimum |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property and equipment, estimated useful life | 2 years |  |
Software Development | Maximum |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property and equipment, estimated useful life | 3 years |  |

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