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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
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
Segment Reporting Revenue Reconciling Item [Line Items]
Depreciation and amortization	$ 85,239	$ 80,817	$ 77,824
Unallocated
Segment Reporting Revenue Reconciling Item [Line Items]
Depreciation and amortization	21,000	19,400	20,600
Software Products | Operating Segments
Segment Reporting Revenue Reconciling Item [Line Items]
Depreciation and amortization	4,000	4,200	4,600
Professional Services | Operating Segments
Segment Reporting Revenue Reconciling Item [Line Items]
Depreciation and amortization	$ 1,100	$ 1,100	$ 1,400

X

- Definition

The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 22
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e8736-108599

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585

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X

- 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.

+ References

No definition available.

+ Details

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