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Fair Value Measurements (Reconciliation of Liability) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Mar. 31, 2022 | Mar. 31, 2021 | Mar. 31, 2022 | Mar. 31, 2021
Contingent Consideration | Estimate of Fair Value Measurement | Fair Value, Measurements, Recurring |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Fair value at beginning of period |  |  | $ 6,200 |
Fair value at end of period | $ 6,200 |  | 6,200 |
Fair Value, Inputs, Level 3 |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Fair value at beginning of period | 6,200 | $ 10,000 | 6,200 | $ 4,228
Contingent consideration recognized for acquired business | 0 | 8,000 | 0 | 8,000
Contingent consideration payments | 0 | (10,000) | 0 | (10,000)
Change in fair value of contingent consideration | 0 | 0 | 0 | 5,772
Fair value at end of period | 6,200 | $ 8,000 | 6,200 | $ 8,000
Fair Value, Inputs, Level 3 | Contingent Consideration | Fair Value, Measurements, Recurring |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Fair value at beginning of period |  |  | 6,200 |
Fair value at end of period | 6,200 |  | 6,200 |
Fair Value, Inputs, Level 3 | Contingent Consideration | Estimate of Fair Value Measurement | Fair Value, Measurements, Recurring | Ctek, Inc. ("Ctek") |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Fair value at end of period | $ 300 |  | $ 300 |

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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition Amount of gain (loss) recognized in income from liability measured at fair value on recurring basis using unobservable input (level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 + Details
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- Definition Amount of issuances of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 + Details
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