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Nature of Business and Summary of Significant Accounting Policies - Additional Information (Details) - USD ($) | 12 Months Ended
--- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2018
Property, Plant and Equipment [Line Items] |  |  |
Other investments | $ 1,060,000 | $ 1,643,000 |
Depreciation and amortization, property and equipment | 23,500,000 | 24,200,000 | $ 22,600,000
Foreign exchange gains (losses) | 1,000,000.0 | 0.0 | 400,000
Advertising and promotion costs | 8,700,000 | 3,600,000 | 4,100,000
Capitalized Contract Cost, Impairment Loss | $ 0 | $ 0 | $ 0
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 |  |

X
- Definition Amount of impairment loss for asset recognized from cost incurred to obtain or fulfill contract with customer. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 340 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=68051541&loc=SL49131252-203054 + Details
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- Definition Amount before tax of foreign currency transaction realized and unrealized gain (loss) recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=109240200&loc=d3e30690-110894 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 35 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121605123&loc=d3e30226-110892 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 10 -Section 45 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=120253306&loc=d3e28228-110885 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450222&loc=d3e30840-110895 + Details
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