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Debt - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019	Mar. 15, 2021	Dec. 13, 2019
Line of Credit Facility [Line Items]
Maximum borrowing capacity					$ 150,000
Weighted average interest rate on debt	1.34%
Debt issuance costs	$ 2,300			$ 2,600
Proceeds from long-term debt	617	$ 119,018	$ 0
Debt Instrument [Line Items]
Proceeds from long-term debt	617	119,018	0
Repayments of long-term debt	15,624	$ 55,893	$ 0
Debt issuance costs	$ 2,300			2,600
LIBOR | Maximum
Line of Credit Facility [Line Items]
Debt instrument, basis spread on variable rate	3.25%
LIBOR | Minimum
Line of Credit Facility [Line Items]
Debt instrument, basis spread on variable rate	1.25%
Term loan
Line of Credit Facility [Line Items]
Maximum borrowing capacity					50,000
Revolving loan
Line of Credit Facility [Line Items]
Maximum borrowing capacity				$ 200,000	$ 100,000

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- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

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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

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- Definition

Weighted average interest rate of debt outstanding.

+ References

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- Definition

Amount, before accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=124435984&loc=d3e28555-108399

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+ References

No definition available.

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- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ 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
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- Definition

The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer.

+ References

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-Publisher FASB
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-Topic 230
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-Section 45
-Paragraph 14
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- Definition

The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

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