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Debt (Narratives) (Details) - USD ($) |  | 1 Months Ended | 3 Months Ended |  |
--- | --- | --- | --- | --- | ---
Aug. 09, 2019 | Oct. 29, 2020 | Sep. 30, 2020 | Sep. 30, 2019 | Jun. 30, 2020 | May 08, 2020
Line Of Credit Facility [Line Items] |  |  |  |  |  |
Outstanding letters of credit |  |  | $ 7,700,000 |  |  |
Interest Expense |  |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |  |
Amortization of deferred financing costs |  |  | $ 800,000 | $ 500,000 |  |
2019 Credit Agreement |  |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |  |
Deferred financing cost |  |  |  |  | $ 10,500,000 |
Amortization of deferred financing costs | $ 1,600,000 |  |  |  |  |
Debt instrument interest rate |  |  | 4.85% |  |  |
2019 Credit Agreement | First Amendment |  |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |  |
Amendment start date |  |  | Apr. 08, 2020 |  |  |
2019 Credit Agreement | Second Amendment |  |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |  |
Amendment start date |  |  | May 08, 2020 |  |  |
2019 Credit Agreement | Term Loan |  |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |  |
Credit Facility, term | 5 years |  |  |  |  |
Borrowing capacity from Credit Agreement | $ 380,000,000 |  |  |  |  |
2019 Credit Agreement | Revolving Facility |  |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |  |
Credit Facility, term | 5 years |  |  |  |  |
Borrowing capacity from Credit Agreement | $ 75,000,000 |  | $ 55,000,000.0 |  |  |
Repayments of Lines of Credit |  |  | $ 20,000,000.0 |  |  |
Line of credit facility intent to pay period |  |  | 12 months |  |  |
Borrowing capacity from Credit Agreement |  |  | $ 20,000,000.0 |  |  |
Line of credit outstanding, Current |  |  | $ 35,000,000.0 |  |  |
2019 Credit Agreement | Revolving Facility | Subsequent Event |  |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |  |
Repayments of Lines of Credit |  | $ 20,000,000.0 |  |  |  |
Line of credit facility remaining outstanding balance |  | $ 15,000,000.0 |  |  |  |
2019 Credit Agreement | Revolving Facility | Second Amendment |  |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |  |
Borrowing capacity from Credit Agreement |  |  |  |  |  | $ 55,000,000.0
2019 Credit Agreement | Revolving Facility | Applicable Margin for Eurodollar | Second Amendment |  |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |  |
Euro dollar rate |  |  |  |  |  | 4.50%
Initial Term Loan | Revolving Facility |  |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |  |
Base rate | 0.00% |  |  |  |  |
Commitment fee | 0.40% |  |  |  |  |
Amendments [Member] |  |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |  |
Deferred financing cost |  |  |  |  | $ 1,500,000 |
Maximum | 2019 Credit Agreement |  |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |  |
Additional incremental loan facility that may be requested | $ 100,000,000 |  |  |  |  |
Maximum | Initial Term Loan | Applicable Margin for Eurodollar |  |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |  |
Borrowings, interest rate | 3.50% |  |  |  |  |
Maximum | Initial Term Loan | Applicable Margin for Base Rate |  |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |  |
Borrowings, interest rate | 2.50% |  |  |  |  |
Maximum | Initial Term Loan | Revolving Facility |  |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |  |
Commitment fee | 0.40% |  |  |  |  |
Minimum | Initial Term Loan | Applicable Margin for Eurodollar |  |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |  |
Borrowings, interest rate | 1.25% |  |  |  |  |
Minimum | Initial Term Loan | Applicable Margin for Base Rate |  |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |  |
Borrowings, interest rate | 0.25% |  |  |  |  |
Minimum | Initial Term Loan | Revolving Facility |  |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |  |
Commitment fee | 0.25% |  |  |  |  |

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- Definition Timeframe period on line of credit facility where it is intended to fully pay down to $0, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Amount of amortization expense attributable to debt issuance costs. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(8)) -URI http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=119993939&loc=d3e28555-108399 + Details
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- Definition Amount, after 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 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: 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=119993939&loc=d3e28555-108399 + Details
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- Definition The carrying value as of the balance sheet date of the current portion of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(13)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(19)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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