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LONG-TERM DEBT - Narrative (Details) £ in Thousands | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Jun. 30, 2019 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2019 GBP (£) | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2019 EUR (€) | Sep. 30, 2018 EUR (€) | Apr. 30, 2016 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Unrealized gain (loss) on fair value of interest rate swaps, before tax |  | $ 534,000 |  | $ 11,309,000 |  |  |  |
Unrealized gain (loss) on fair value of interest rate swaps, after tax |  | 403,000 |  | 8,538,000 |  |  |  |
Unrealized gain (loss) expected to be recognized over the next 12 months |  | 48,000 |  |  |  |  |  |
Other debt |  | 395,000 |  | 5,399,000 |  |  |  |
Foreign currency translation adjustment |  | 3,320,000 |  |  |  |  |  |
Foreign currency translation adjustment, tax |  | 1,077,000 |  |  |  |  |  |
Contested letter of credit |  |  |  |  | $ 11,325,000 |  |  |
Other current assets |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Contested letter of credit |  | 10,541,000 | £ 8,570 |  |  |  |  |
Securitization facility |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Maximum amount of borrowings available |  | 115,000,000 |  |  |  |  |  |
Outstanding borrowings |  | $ 93,950,000 |  | $ 102,250,000 |  |  |  |
Interest rate (as a percent) |  | 2.77% |  | 3.01% |  | 2.77% | 3.01% |
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) |  | 2.17% |  | 2.21% |  | 2.17% | 2.21% |
Line of Credit | Domestic Credit Facility Amendment Agreement |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Weighted-average interest rate on outstanding borrowings (as a percent) |  | 2.65% |  | 3.12% |  | 2.65% | 3.12% |
2025 Senior Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt issued |  | $ 300,000,000 |  |  |  |  |  |
Fixed interest rate (as a percent) |  | 5.25% |  |  |  | 5.25% |  |
Financing fees and costs |  | $ 4,127,000 |  |  |  |  |  |
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 |  |
Fixed interest rate (as a percent) |  | 1.40% |  |  |  | 1.40% |  |
Portion of debt bearing fixed interest | € |  |  |  |  |  | € 5,000,000.0 |  |
Revolving Credit Facility | April 2016 Debt Amendment |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Maximum borrowing amount drawn In foreign currency |  | $ 150,000 |  |  |  |  |  |
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 |  | 0.25% | 0.25% |  |  |  |  |
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 |  |  |  |  |  |  |  | $ 900,000,000
Outstanding borrowings |  | $ 325,638,000 |  | $ 319,500,000 |  |  |  |
Senior secured term loan | Line of Credit | Domestic Credit Facility Amendment Agreement |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Maximum amount of borrowings available |  |  |  |  |  |  |  | $ 250,000,000
Principal payment due in one year (as a percent) |  | 5.00% | 5.00% |  |  |  |  |
Principal payment in year two (as a percent) |  | 7.50% | 7.50% |  |  |  |  |
Principal payment years three through five (as a percent) |  | 10.00% | 10.00% |  |  |  |  |
Outstanding borrowings |  | $ 53,497,000 |  | 212,086,000 |  |  |  |
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 | April 2016 Debt Amendment |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Outstanding borrowings |  | 136,470,000 |  |  |  | € 125,000,000.0 |  |
Term Loan | April 2016 Debt Amendment |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Additional unscheduled principal payment | $ 140,000,000 |  |  |  |  |  |  |
Foreign Line of Credit | Credit Facility With European Bank |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Maximum amount of borrowings available |  | 38,212,000 |  |  |  | 35,000,000.0 |  |
Outstanding borrowings |  | $ 14,024,000 |  | $ 3,211,000 |  | € 12,800,000 | € 2,800,000 |
Weighted-average interest rate on outstanding borrowings (as a percent) |  | 1.25% |  | 1.75% |  | 1.25% | 1.75% |

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