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Segment Information - Property and Equipment Net on Geographical Basis (Detail) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Segment Reporting Information [Line Items]
Property and equipment, net	$ 40,703	$ 45,122
United States
Segment Reporting Information [Line Items]
Property and equipment, net	30,773	36,083
United Kingdom
Segment Reporting Information [Line Items]
Property and equipment, net	4,893	3,769
Other countries
Segment Reporting Information [Line Items]
Property and equipment, net	$ 5,037	$ 5,270
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	76.00%	80.00%
Geographic Concentration Risk | United Kingdom | Property Plant and Equipment
Segment Reporting Information [Line Items]
Concentration of risk, percentage	12.00%	8.00%
Geographic Concentration Risk | Other countries | Property Plant and Equipment
Segment Reporting Information [Line Items]
Concentration of risk, percentage	12.00%	12.00%

X

- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 18
-URI http://asc.fasb.org/extlink&oid=84177426&loc=d3e6351-108592

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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-Topic 825
-SubTopic 10
-Section 50
-Paragraph 20
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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://www.xbrl.org/2003/role/presentationRef
-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

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-Section S99
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-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
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-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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