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LONG-TERM DEBT - Narrative (Details) £ in Thousands | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Sep. 30, 2020 USD ($) | Sep. 30, 2020 GBP (£) | Sep. 30, 2019 USD ($) | Sep. 30, 2020 EUR (€) | Sep. 30, 2019 EUR (€) | Apr. 30, 2016 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |
Other debt | $ 20,742,000 |  | $ 395,000 |  |  |
Finance lease liabilities | 9,684,000 |  | 3,631,000 |  |  |
Foreign currency translation adjustment | 4,377,000 |  | (3,320,000) |  |  |
Foreign currency translation adjustment, tax | (1,420,000) |  | 1,077,000 |  |  |
Designated as Hedging Instrument |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Unrealized gain (loss) expected to be recognized over the next 12 months | 2,389,000 |  |  |  |  |
Interest Rate Swaps | Cash Flow Hedging | Designated as Hedging Instrument |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Net unrealized loss | (7,792,000) |  | (534,000) |  |  |
Net unrealized (loss) gain after tax | 5,884,000 |  | 403,000 |  |  |
Other current assets |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Contested letter of credit | 11,032,000 | £ 8,570 |  |  |  |
March 2020 Debt Amendment |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt issuance costs | 2,000,000 |  |  |  |  |
Securitization facility |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Maximum amount of borrowings available | 115,000,000 |  |  |  |  |
Outstanding borrowings | $ 67,700,000 |  | $ 93,950,000 |  |  |
Interest rate (as a percent) | 0.90% |  | 2.77% | 0.90% | 2.77% |
Securitization facility | LIBOR |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Variable interest rate (as a percent) | 0.75% | 0.75% |  |  |  |
Securitization facility | Minimum |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Commitment fee (as a percent) | 0.25% | 0.25% |  |  |  |
Securitization facility | Maximum |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Commitment fee (as a percent) | 0.35% | 0.35% |  |  |  |
Other Debt |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Weighted-average interest rate on outstanding borrowings (as a percent) | 2.10% |  | 2.17% | 2.10% | 2.17% |
Line of Credit | Domestic Credit Facility Amendment Agreement |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Weighted-average interest rate on outstanding borrowings (as a percent) | 2.41% |  | 2.65% | 2.41% | 2.65% |
2025 Senior Notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt issuance costs | $ 2,744,000 |  | $ 3,284,000 |  |  |
Debt issued | $ 300,000,000 |  |  |  |  |
Fixed interest rate (as a percent) | 5.25% |  |  | 5.25% |  |
2025 Senior Notes | Matthews Europe GmbH & Co. KG |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Weighted-average interest rate on outstanding borrowings (as a percent) | 1.40% |  |  | 1.40% |  |
Debt issued | $ 16,376,000 |  |  | € 15,000,000.0 |  |
Revolving Credit Facility | March 2020 Debt Amendment |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Maximum borrowing amount drawn In foreign currency | $ 350,000,000 |  |  |  |  |
Revolving Credit Facility | Line of Credit | LIBOR |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate on borrowings (as a percent) | 1.50% |  |  | 1.50% |  |
Revolving Credit Facility | Line of Credit | Minimum |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Annual commitment fee range on unused portion | 0.15% | 0.15% |  |  |  |
Revolving Credit Facility | Line of Credit | Minimum | LIBOR |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate on borrowings, based on leverage ratio | 0.75% | 0.75% |  |  |  |
Revolving Credit Facility | Line of Credit | Maximum |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Annual commitment fee range on unused portion | 0.30% | 0.30% |  |  |  |
Revolving Credit Facility | Line of Credit | Maximum | LIBOR |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate on borrowings, based on leverage ratio | 2.00% | 2.00% |  |  |  |
Revolving Credit Facility | Line of Credit | Domestic Credit Facility Amendment Agreement |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Maximum amount of borrowings available |  |  |  |  |  | $ 750,000,000
Outstanding borrowings | $ 257,439,000 |  | 325,638,000 |  |  |
Senior secured term loan | Line of Credit | Domestic Credit Facility Amendment Agreement |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Maximum amount of borrowings available |  |  |  |  |  | $ 35,000,000
Outstanding borrowings | 22,359,000 |  | 53,497,000 |  |  |
Standby Letters of Credit | Line of Credit | Domestic Credit Facility Amendment Agreement |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Maximum amount of borrowings available | 35,000,000 |  |  |  |  |
Line of Credit | Euro Member Countries, Euro | March 2020 Debt Amendment |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Outstanding borrowings | 137,188,000 |  | 136,470,000 | € 117,000,000.0 | € 125,000,000.0 |
Foreign Line of Credit | Credit Facility With European Bank |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Maximum amount of borrowings available | 41,039,000 |  |  | 35,000,000.0 |  |
Outstanding borrowings | $ 22,166,000 |  | $ 14,024,000 | € 18,900,000 | € 12,800,000 |
Weighted-average interest rate on outstanding borrowings (as a percent) | 1.25% |  |  | 1.25% |  |

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