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Debt - Narrative (Details) £ in Thousands | 3 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2018 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2018 USD ($) | Dec. 31, 2018 EUR (€) | Sep. 30, 2018 EUR (€) | Dec. 31, 2017 USD ($) | Sep. 30, 2014 GBP (£)
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Other debt | $ 3,186,000 | $ 5,399,000 | $ 5,399,000 |  |  |  |
Other current assets | 73,145,000 | 62,937,000 | 62,937,000 |  |  |  |
Designated as Hedging Instrument |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Unrealized gain (loss) on fair value of interest rate swaps, before tax | 7,467,000 |  | 11,309,000 |  |  |  |
Unrealized gain (loss) on fair value of interest rate swaps, after tax | 5,638,000 | 8,538,000 |  |  |  |  |
Unrealized gain (loss) expected to be recognized over the next 12 months | $ 2,154,000 |  |  |  |  |  |
Senior Notes | Matthews Europe GmbH & Co. KG |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Weighted-average interest rate on outstanding borrowings (as a percent) | 1.40% |  |  | 1.40% |  | 1.40% |
Debt issued amount | $ 17,169,000 |  |  | € 15,000,000 |  |  |
Fixed interest rate (as a percent) | 1.40% |  |  | 1.40% |  |  |
Portion of debt subject to fixed interest rate | € |  |  |  | € 5,000,000 |  |  |
LIBOR | Senior Notes | Matthews Europe GmbH & Co. KG |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Interest rate on borrowings (as a percent) | 1.40% |  |  |  |  |  |
Senior Notes 2025 | Senior Notes |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Debt issued amount |  |  |  |  |  | $ 300,000,000 |
Fixed interest rate (as a percent) |  |  |  |  |  | 5.25% |
Securitization Facility |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Maximum amount of borrowings available | $ 115,000,000 |  |  |  |  |  |
Outstanding borrowings | $ 109,200,000 | 102,250,000 | 102,250,000 |  |  |  |
Interest rate on facility (as a percent) | 3.25% |  |  | 3.25% |  | 2.31% |
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% |  |  |  |  |  |
Other Debt |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Weighted-average interest rate on outstanding borrowings (as a percent) | 5.54% |  |  | 5.54% |  | 4.62% |
Revolving Credit Facility | LIBOR |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Interest rate during period (as a percent) | 1.25% |  |  |  |  |  |
Revolving Credit Facility | LIBOR | Minimum |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Interest rate on borrowings (as a percent) | 0.75% |  |  |  |  |  |
Revolving Credit Facility | LIBOR | Maximum |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Interest rate on borrowings (as a percent) | 2.00% |  |  |  |  |  |
Revolving Credit Facility | April 2016 Debt Amendment |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Maximum amount of borrowings available | $ 900,000,000 |  |  |  |  |  |
Maturity date | Apr. 26, 2021 |  |  |  |  |  |
Revolving Credit Facility | April 2016 Debt Amendment | Minimum |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Annual commitment fee range on unused portion (as a percent) | 0.15% |  |  |  |  |  |
Revolving Credit Facility | April 2016 Debt Amendment | Maximum |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Annual commitment fee range on unused portion (as a percent) | 0.25% |  |  |  |  |  |
Term Loan | April 2016 Debt Amendment |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Maximum amount of borrowings available | $ 250,000,000 |  |  |  |  |  |
Long term debt outstanding principal payment in year 1 (as a percent) | 5.00% |  |  | 5.00% |  |  |
Long term debt outstanding principal payment in year 2 (as a percent) | 7.50% |  |  | 7.50% |  |  |
Long term debt outstanding principal payment in year 3 (as a percent) | 10.00% |  |  | 10.00% |  |  |
Long term debt outstanding principal payment in year 4 (as a percent) | 10.00% |  |  | 10.00% |  |  |
Long term debt outstanding principal payment in year 5 (as a percent) | 10.00% |  |  | 10.00% |  |  |
Outstanding borrowings | $ 205,876,000 | 212,086,000 | 212,086,000 |  |  |  |
Term Loan | April 2016 Debt Amendment | LIBOR |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Interest rate during period (as a percent) | 1.25% |  |  |  |  |  |
Term Loan | April 2016 Debt Amendment | LIBOR | Minimum |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Interest rate on borrowings (as a percent) | 0.75% |  |  |  |  |  |
Term Loan | April 2016 Debt Amendment | LIBOR | Maximum |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Interest rate on borrowings (as a percent) | 2.00% |  |  |  |  |  |
Domestic Revolving Credit Facility | April 2016 Debt Amendment |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Maximum available for issuance of trade and standby letters of credit | $ 35,000,000 |  |  |  |  |  |
Outstanding borrowings | $ 322,500,000 | 319,500,000 | 319,500,000 |  |  |  |
Weighted-average interest rate on outstanding borrowings (as a percent) | 3.06% |  |  | 3.06% |  | 2.93% |
Letter of Credit |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Other current assets | $ 10,916,000 |  |  |  |  |  | £ 8,570
Foreign Line of Credit | Credit Facility With European Bank |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Maximum amount of borrowings available | 40,061,000 |  |  | € 35,000,000.0 |  |  |
Outstanding borrowings | $ 24,466,000 | $ 3,211,000 | $ 3,211,000 | € 21,400,000 | € 2,800,000 |  |
Weighted-average interest rate on outstanding borrowings (as a percent) | 1.25% |  |  | 1.25% |  | 2.00% |

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