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Fair Value Measurements (Financial Assets and Liabilities) (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Mar. 31, 2021 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Sep. 30, 2019
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Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Total liabilities measured at fair value | $ 0 |  | $ 0 |  |  |
Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Total liabilities measured at fair value | 0 |  | 0 |  |  |
Fair Value, Inputs, Level 3 |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Contingent consideration fair value | 5,900 | $ 8,000 | 4,228 | $ 4,228 | $ 10,379 | $ 5,407
Fair Value, Inputs, Level 3 | Fair Value, Measurements, Recurring |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Total liabilities measured at fair value | 5,900 |  | 4,228 |  |  |
Contingent Consideration | Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Contingent consideration fair value | 0 |  | 0 |  |  |
Contingent Consideration | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Contingent consideration fair value | 0 |  | 0 |  |  |
Contingent Consideration | Fair Value, Inputs, Level 3 | Fair Value, Measurements, Recurring |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Contingent consideration fair value | 5,900 |  | 4,228 |  |  |
Estimate of Fair Value Measurement | Fair Value, Measurements, Recurring |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Total liabilities measured at fair value | 5,900 |  | 4,228 |  |  |
Estimate of Fair Value Measurement | Contingent Consideration | Fair Value, Measurements, Recurring |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Contingent consideration fair value | $ 5,900 |  | $ 4,228 |  |  |

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- 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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- Definition Fair value 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) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 + Details
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