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Segment Information - Property and Equipment Net on Geographical Basis (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2018 | Sep. 30, 2017
Segment Reporting Information [Line Items] |  |
Property and equipment, net | $ 48,837 | $ 40,703
United States |  |
Segment Reporting Information [Line Items] |  |
Property and equipment, net | 39,593 | 30,773
United Kingdom |  |
Segment Reporting Information [Line Items] |  |
Property and equipment, net | 4,296 | 4,893
Other countries |  |
Segment Reporting Information [Line Items] |  |
Property and equipment, net | $ 4,948 | $ 5,037
Geographic Concentration Risk | Property Plant and Equipment |  |
Segment Reporting Information [Line Items] |  |
Concentration of risk, Percentage | 100.00% | 100.00%
Geographic Concentration Risk | United States | Property Plant and Equipment |  |
Segment Reporting Information [Line Items] |  |
Concentration of risk, Percentage | 81.00% | 76.00%
Geographic Concentration Risk | United Kingdom | Property Plant and Equipment |  |
Segment Reporting Information [Line Items] |  |
Concentration of risk, Percentage | 9.00% | 12.00%
Geographic Concentration Risk | Other countries | Property Plant and Equipment |  |
Segment Reporting Information [Line Items] |  |
Concentration of risk, Percentage | 10.00% | 12.00%

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- Definition Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(14)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(8)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(13)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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