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Debt - Narrative (Details) | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Mar. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Mar. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Mar. 31, 2021 USD ($) | Sep. 30, 2020 USD ($) | Mar. 31, 2021 EUR (€) | Sep. 30, 2020 EUR (€)
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Foreign currency translation adjustment, net of tax | $ 8,897,000 | $ (17,052,000) | $ 30,647,000 | $ (11,106,000) |  |  |  |
Designated as Hedging Instrument |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Unrealized loss expected to be recognized over the next 12 months | (1,772,000) |  |  |  | $ (1,772,000) |  |  |
Foreign currency translation adjustment, net of tax |  |  |  |  | 4,852,000 | $ 4,377,000 |  |
Foreign currency translation adjustment, tax |  |  |  |  | 1,575,000 | 1,420,000 |  |
Designated as Hedging Instrument | Interest rate swap contracts | Cash Flow Hedging |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Unrealized loss on fair value of interest rate swaps, before tax |  |  |  |  | (2,905,000) | (7,792,000) |  |
Unrealized loss on fair value of interest rate swaps, after tax |  |  |  |  | (2,194,000) | (5,884,000) |  |
2025 Senior Notes |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Unamortized debt costs | 2,474,000 |  |  |  | 2,474,000 | 2,744,000 |  |
Senior Notes 2025 | 2025 Senior Notes |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Debt issued amount | $ 300,000,000 |  |  |  | $ 300,000,000 |  |  |
Fixed interest rate (as a percent) | 5.25% |  |  |  | 5.25% |  | 5.25% |
Securitization Facility |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Maximum amount of borrowings available | $ 115,000,000 |  |  |  | $ 115,000,000 |  |  |
Outstanding borrowings | $ 97,590,000 |  |  |  | $ 97,590,000 | 67,700,000 |  |
Interest rate on facility (as a percent) | 0.86% |  | 1.74% |  | 0.86% |  | 0.86% |
Securitization Facility | Minimum |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Commitment fee (as a percent) |  |  |  |  | 0.25% |  |  |
Securitization Facility | Maximum |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Commitment fee (as a percent) |  |  |  |  | 0.35% |  |  |
Securitization Facility | LIBOR |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Interest rate on borrowings (as a percent) |  |  |  |  | 0.75% |  |  |
Revolving Credit Facility | March 2020 Debt Amendment |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Maximum amount of borrowings available | $ 750,000,000 |  |  |  | $ 750,000,000 |  |  |
Maximum borrowing amount drawn In foreign currency | 350,000,000 |  |  |  | 350,000,000 |  |  |
Unamortized debt costs | 2,481,000 |  |  |  | $ 2,481,000 | 2,734,000 |  |
Revolving Credit Facility | March 2020 Debt Amendment | Minimum |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Annual commitment fee range on unused portion (as a percent) |  |  |  |  | 0.15% |  |  |
Revolving Credit Facility | March 2020 Debt Amendment | Maximum |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Annual commitment fee range on unused portion (as a percent) |  |  |  |  | 0.30% |  |  |
Term Loan | March 2020 Debt Amendment |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Maximum amount of borrowings available | 35,000,000 |  |  |  | $ 35,000,000 |  |  |
Outstanding borrowings | 0 |  |  |  | $ 0 | 22,359,000 |  |
Term Loan | March 2020 Debt Amendment | LIBOR |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Interest rate during period (as a percent) |  |  |  |  | 1.25% |  |  |
Term Loan | March 2020 Debt Amendment | LIBOR | Minimum |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Interest rate on borrowings (as a percent) |  |  |  |  | 0.75% |  |  |
Term Loan | March 2020 Debt Amendment | LIBOR | Maximum |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Interest rate on borrowings (as a percent) |  |  |  |  | 2.00% |  |  |
Domestic Revolving Credit Facility | March 2020 Debt Amendment |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Maximum available for issuance of trade and standby letters of credit | $ 35,000,000 |  |  |  | $ 35,000,000 |  |  |
Weighted-average interest rate on outstanding borrowings (as a percent) | 2.17% |  | 2.40% |  | 2.17% |  | 2.17% |
Foreign Line of Credit | Credit Facility With European Bank |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Maximum amount of borrowings available | $ 29,321,000 |  |  |  | $ 29,321,000 |  | € 25,000,000.0 |
Outstanding borrowings | $ 3,587,000 |  |  |  | $ 3,587,000 | 22,166,000 | € 3,100,000 | € 18,900,000
Weighted-average interest rate on outstanding borrowings (as a percent) | 2.25% |  | 1.25% |  | 2.25% |  | 2.25% |
Foreign Line of Credit | Credit Facility With European Bank | Bank Guarantees |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Maximum amount of borrowings available | $ 9,383,000 |  |  |  | $ 9,383,000 |  | € 8,000,000.0 |
United States of America, Dollars | Domestic Revolving Credit Facility | March 2020 Debt Amendment |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Outstanding borrowings | 250,000,000 |  |  |  | 250,000,000 | 257,439,000 |  |
Euro Member Countries, Euro | Domestic Revolving Credit Facility | March 2020 Debt Amendment |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Outstanding borrowings | $ 113,764,000 |  |  |  | $ 113,764,000 | $ 137,188,000 | € 97,000,000.0 | € 117,000,000.0

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- Definition Amount of after tax unrealized gain (loss) related to the increase or decrease in fair value of interest rate derivatives designated as cash flow hedging instruments, which was recorded in accumulated other comprehensive income to the extent that the cash flow hedge was determined to be effective. + References No definition available. + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + 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 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions 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 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -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 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 + Details
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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 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition Amount after tax and reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121641772&loc=SL7669646-108580 + Details
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