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DEBT AND OTHER OBLIGATIONS DEBT AND OTHER OBLIGATIONS (Details) $ in Thousands, $ in Millions |  | 3 Months Ended | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 01, 2013 SGD ($) renewal_option | Dec. 28, 2019 USD ($) | Sep. 28, 2019 USD ($) | Sep. 29, 2019 USD ($) | Feb. 15, 2019 USD ($) | Sep. 29, 2018 USD ($) | Dec. 01, 2013 USD ($) ft² | Nov. 22, 2013 USD ($)
Capital Leased Assets [Line Items] |  |  |  |  |  |  |  |
Financing obligation |  | $ 0 | $ 14,207 |  |  |  | $ 20,000 |
Property, plant and equipment, net |  | 56,826 | 72,370 |  |  |  |  |
Cumulative effect of accounting changes |  |  | (769) |  |  | $ 534 |  |
Short term debt |  | $ 75,967 | 60,904 |  |  |  |  |
K&S Corporate Headquarters [Member] |  |  |  |  |  |  |  |
Capital Leased Assets [Line Items] |  |  |  |  |  |  |  |
Lease Agreement Term | 10 years | 10 years |  |  |  |  |  |
Lessee Leasing Arrangements, Capital Leases, Number of Renewal Options | renewal_option | 2 |  |  |  |  |  |  |
Lessee Leasing Arrangements, Capital Leases, Renewal Term | 10 years |  |  |  |  |  |  |
Annual Rent and Service Charge Minimum Range | $ 4 |  |  |  |  |  |  |
Annual Rent and Service Charge Maximum Range | $ 5 |  |  |  |  |  |  |
Area of Land | ft² |  |  |  |  |  |  | 198,000 |
Percentage Of Building Area To Be Leased From Landlord |  |  |  |  |  |  | 70.00% |
Capital Lease Obligations, Interest Rate, Effective Percentage |  |  |  |  |  |  | 6.30% |
Citibank [Member] |  |  |  |  |  |  |  |
Capital Leased Assets [Line Items] |  |  |  |  |  |  |  |
Capacity under credit facility |  |  |  |  |  |  |  | $ 5,000
Outstanding amounts under credit facility |  | $ 3,300 |  |  |  |  |  |
Current and Noncurrent Portion |  |  |  |  |  |  |  |
Capital Leased Assets [Line Items] |  |  |  |  |  |  |  |
Financing obligation |  |  | $ 15,000 |  |  |  |  |
Facility Agreements [Member] | MUFG Bank, Ltd., Singapore Branch [Member] |  |  |  |  |  |  |  |
Capital Leased Assets [Line Items] |  |  |  |  |  |  |  |
Capacity under credit facility |  |  |  |  | $ 150,000 |  |  |
London Interbank Offered Rate (LIBOR) [Member] | Facility Agreements [Member] | MUFG Bank, Ltd., Singapore Branch [Member] |  |  |  |  |  |  |  |
Capital Leased Assets [Line Items] |  |  |  |  |  |  |  |
Debt instrument, basis spread on variable rate |  |  | 1.50% |  |  |  |  |
Building |  |  |  |  |  |  |  |
Capital Leased Assets [Line Items] |  |  |  |  |  |  |  |
Property, plant and equipment, useful life |  | 25 years |  |  |  |  |  |
Accounting Standards Update 2016-02 |  |  |  |  |  |  |  |
Capital Leased Assets [Line Items] |  |  |  |  |  |  |  |
Financing obligation |  |  |  | $ (14,500) |  |  |  |
Property, plant and equipment, net |  |  |  | (15,300) |  |  |  |
Cumulative effect of accounting changes |  |  |  | $ (800) |  |  |  |

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