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Significant Accounting Policies (Details) | 12 Months Ended
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Sep. 30, 2021 business
Property, Plant and Equipment [Line Items] |
Number of businesses acquired | 3
Operating lease, weighted average discount rate, percent | 3.40%
Unrecognized compensation costs, period for recognition | 1 year 3 months 18 days
Restricted Stock Units | Share-based Payment Arrangement, Tranche One |
Property, Plant and Equipment [Line Items] |
Vesting period | 1 year
Restricted Stock Units | Share-based Payment Arrangement, Tranche Two |
Property, Plant and Equipment [Line Items] |
Vesting period | 4 years
Restricted Stock Units | Share-based Payment Arrangement, Tranche Three |
Property, Plant and Equipment [Line Items] |
Vesting period | 5 years
Performance Stock Units |
Property, Plant and Equipment [Line Items] |
Vesting period | 3 years
Unrecognized compensation costs, period for recognition | 3 years
Maximum | Restricted Stock Units |
Property, Plant and Equipment [Line Items] |
Vesting period | 5 years
Minimum | Restricted Stock Units |
Property, Plant and Equipment [Line Items] |
Vesting period | 4 years
Office Space | Maximum |
Property, Plant and Equipment [Line Items] |
Property, plant and equipment, useful life | 39 years
Office furniture | Maximum |
Property, Plant and Equipment [Line Items] |
Property, plant and equipment, useful life | 7 years
Software and Software Development Costs | Maximum |
Property, Plant and Equipment [Line Items] |
Property, plant and equipment, useful life | 8 years
Software and Software Development Costs | Minimum |
Property, Plant and Equipment [Line Items] |
Property, plant and equipment, useful life | 3 years

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- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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