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LONG-TERM DEBT - Narrative (Details) £ in Thousands | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2017 USD ($) | Sep. 30, 2017 GBP (£) | Sep. 30, 2016 USD ($) | Sep. 30, 2017 EUR (€) | Nov. 30, 2016 EUR (€) | Sep. 30, 2016 EUR (€) | Apr. 30, 2016 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |
Unrealized gain (loss) on fair value of interest rate swaps, before tax | $ 3,959,000 |  | $ 5,834,000 |  |  |  |
Unrealized gain (loss) on fair value of interest rate swaps, after tax | 2,415,000 |  | 3,559,000 |  |  |  |
Unrealized gain (loss) expected to be recognized over the next 12 months | 666,000 |  |  |  |  |  |
Other debt | 1,032,000 |  | $ 4,579,000 |  |  |  |
Contested letter of credit | 11,325,000 |  |  |  |  |  |
Other current assets |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Contested letter of credit | 11,477,000 | £ 8,570 |  |  |  |  |
Securitization facility |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Maximum amount of borrowings available | 115,000,000 |  |  |  |  |  |
Outstanding borrowings | $ 95,825,000 |  |  |  |  |  |
Debt instrument term (in years) | 2 years | 2 years |  |  |  |  |
Interest rate (as a percent) | 1.98% |  |  | 1.98% |  |  |
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) | 5.04% |  | 3.31% | 5.04% |  | 3.31% |
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 | $ 17,719,000 |  |  |  | € 15,000,000 |  |
Portion of debt bearing fixed interest | € |  |  |  |  | € 5,000,000 |  |
Fixed interest rate (as a percent) |  |  |  |  | 1.40% |  |
Revolving credit facilities | Domestic Credit Facility Amendment Agreement |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Weighted-average interest rate on outstanding borrowings (as a percent) | 3.01% |  | 2.59% | 3.01% |  | 2.59% |
Revolving Credit Facility | Revolving credit facilities | LIBOR |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Interest rate on borrowings (as a percent) | 1.75% |  |  | 1.75% |  |  |
Revolving Credit Facility | Revolving credit facilities | Minimum |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Annual commitment fee range on unused portion | 0.15% | 0.15% |  |  |  |  |
Revolving Credit Facility | Revolving credit facilities | Minimum | LIBOR |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Interest rate on borrowings, based on leverage ratio | 0.75% | 0.75% |  |  |  |  |
Revolving Credit Facility | Revolving credit facilities | Maximum |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Annual commitment fee range on unused portion | 0.25% | 0.25% |  |  |  |  |
Revolving Credit Facility | Revolving credit facilities | Maximum | LIBOR |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Interest rate on borrowings, based on leverage ratio | 2.00% | 2.00% |  |  |  |  |
Revolving Credit Facility | Revolving credit facilities | Domestic Credit Facility Amendment Agreement |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Maximum amount of borrowings available |  |  |  |  |  |  | $ 900,000,000
Outstanding borrowings | $ 525,000,000 |  | $ 608,000,000 |  |  |  |
Senior secured term loan | Revolving credit facilities | 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 | $ 232,479,000 |  | 246,449,000 |  |  |  |
Standby Letters of Credit | Revolving credit facilities | Domestic Credit Facility Amendment Agreement |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Maximum amount of borrowings available | 35,000,000 |  |  |  |  |  |
Foreign Line of Credit | Credit Facility With European Bank |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Maximum amount of borrowings available | 41,345,000 |  |  | € 35,000,000.0 |  |  |
Outstanding borrowings | $ 26,126,000 |  | 0 | € 22,100,000 |  |  |
Weighted-average interest rate on outstanding borrowings (as a percent) | 1.75% |  |  | 1.75% |  |  |
Lines of Credit with Italian Banks | Matthews International S.p.A |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Maximum amount of borrowings available | $ 13,384,000 |  |  | € 11,300,000.0 |  |  |
Outstanding borrowings | $ 4,735,000 |  | $ 5,801,000 | € 4,000,000 |  | € 5,200,000 |
Weighted-average interest rate on outstanding borrowings (as a percent) | 2.20% |  | 1.80% | 2.20% |  | 1.80% |
Long-term Debt | $ 3,079,000 |  | $ 3,538,000 | € 2,600,000 |  | € 3,200,000 |

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