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Leases - Primary Office Leases (Details) $ in Thousands	Sep. 30, 2021 USD ($)
Lessee, Lease, Description [Line Items]
Future Minimum Lease Commitments	$ 85,717
Arlington, VA
Lessee, Lease, Description [Line Items]
Lease Termination Term (in years)	10 years 3 months 18 days
Future Minimum Lease Commitments	$ 36,364
Letter of Credit Amount Required	$ 1,579
Riverside, IL
Lessee, Lease, Description [Line Items]
Lease Termination Term (in years)	9 years 6 months
Future Minimum Lease Commitments	$ 42,205
Letter of Credit Amount Required	$ 232
Pune, India
Lessee, Lease, Description [Line Items]
Lease Termination Term (in years)	2 years
Future Minimum Lease Commitments	$ 1,612
Letter of Credit Amount Required	$ 0
Brea, CA
Lessee, Lease, Description [Line Items]
Lease Termination Term (in years)	8 months 12 days
Future Minimum Lease Commitments	$ 739
Letter of Credit Amount Required	$ 0

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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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of lessee's undiscounted obligation for lease payment for operating lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=123408670&loc=SL77918701-209980

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Term of lessee's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=123408670&loc=SL77918673-209980

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Balance Type:	na
Period Type:	instant

X

- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

+ References

No definition available.

+ Details

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Period Type:	instant

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