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ACCOUNTING PRONOUNCEMENTS - Narrative (Details) - USD ($) | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017 | Oct. 01, 2019 | Oct. 01, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Gross profit | $ 142,596,000 | $ 137,178,000 | $ 136,281,000 | $ 126,411,000 | $ 149,513,000 | $ 152,615,000 | $ 150,680,000 | $ 131,413,000 | $ 542,466,000 | $ 584,221,000 | $ 567,788,000 |  |
Accounting Standards Update 2017-07 |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Gross profit |  |  |  |  | $ 729 | $ 714 | $ 714 | $ 714 |  |  |  |  |
Accounting Standards Update 2016-16 |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative tax adjustment for intra-entity transfers |  |  |  |  |  |  |  |  |  |  |  |  | $ (4,176,000)
Retained Earnings | Accounting Standards Update 2016-16 |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative tax adjustment for intra-entity transfers |  |  |  |  |  |  |  |  |  |  |  |  | (4,176,000)
Retained Earnings | Accounting Standards Update 2018-02 |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative tax adjustment for intra-entity transfers | 8,814,000 |  |  |  |  |  |  |  | 8,814,000 |  |  |  |
Accumulated Other Comprehensive (Loss) Income (net of tax) | Accounting Standards Update 2018-02 |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative tax adjustment for intra-entity transfers | $ (8,814,000) |  |  |  |  |  |  |  | $ (8,814,000) |  |  |  |
Cost of Sales | Accounting Standards Update 2017-07 |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification of net benefit costs |  |  |  |  |  |  |  |  |  | (2,871,000) | (4,401,000) |  |
Selling and Marketing Expense | Accounting Standards Update 2017-07 |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification of net benefit costs |  |  |  |  |  |  |  |  |  | (907,000) | (1,391,000) |  |
General and Administrative Expense | Accounting Standards Update 2017-07 |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification of net benefit costs |  |  |  |  |  |  |  |  |  | $ (1,945,000) | $ (2,981,000) |  |
Other Assets | Accounting Standards Update 2016-16 |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative tax adjustment for intra-entity transfers |  |  |  |  |  |  |  |  |  |  |  |  | $ (4,176,000)
Forecast | Subsequent Event | Accounting Standards Update 2016-02 |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Operating lease, right-of-use asset |  |  |  |  |  |  |  |  |  |  |  | $ 85,000,000 |
Operating lease, liability |  |  |  |  |  |  |  |  |  |  |  | $ 85,000,000 |

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