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DEBT AND OTHER OBLIGATIONS (Narrative) (Details) $ in Thousands |  |  | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 29, 2019 USD ($) | Feb. 15, 2019 USD ($) | Oct. 03, 2020 USD ($) renewal_option | Sep. 29, 2020 USD ($) | Sep. 28, 2019 USD ($) | Sep. 29, 2018 USD ($) | Sep. 30, 2017 USD ($) | Dec. 01, 2013 USD ($) ft² | Nov. 22, 2013 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Area of Land | ft² |  |  |  |  |  |  |  | 198,000 |
Percentage Of Building Area Agreed To Lease From Landlord |  |  |  |  |  |  |  | 70.00% |
Financing obligation |  |  | $ 0 |  | $ 14,207 |  |  | $ 20,000 |
Cumulative effect of accounting changes |  |  |  |  | (769) | $ 534 | $ 5,420 |  |
Retained earnings |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Cumulative effect of accounting changes |  |  |  |  | (769) | $ 534 | $ 4,006 |  |
Scenario, Forecast [Member] | Accounting Standards Update 2016-02 [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Financing obligation | $ (14,500) |  |  |  |  |  |  |  |
Decrease property, plant and equipment | 15,300 |  |  | $ 15,300 |  |  |  |  |
Scenario, Forecast [Member] | Accounting Standards Update 2016-02 [Member] | Retained earnings |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Cumulative effect of accounting changes | $ 800 |  |  |  |  |  |  |  |
K&S Corporate Headquarters [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Lessee Leasing Arrangements, Capital Leases, Renewal Term |  |  | 10 years |  |  |  |  |  |
Annual Rent and Service Charge Minimum Range |  |  | $ 4,000 |  |  |  |  |  |
Annual Rent and Service Charge Maximum Range |  |  | $ 5,000 |  |  |  |  |  |
Lessee Leasing Arrangements, Capital Leases, Term of Contract |  |  | 10 years |  |  |  |  |  |
Lessee Leasing Arrangements, Capital Leases, Number of Renewal Options | renewal_option |  |  | 2 |  |  |  |  |  |
Capital Lease Obligations, Interest Rate, Effective Percentage |  |  | 6.30% |  |  |  |  |  |
Building [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Property, Plant and Equipment, Useful Life |  |  | 25 years |  |  |  |  |  |
Citibank [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  |  |  |  |  | $ 5,000
Long-term Line of Credit |  |  | $ 3,300 |  | $ 3,100 |  |  |  |
MUFG Bank, Ltd., Singapore Branch [Member] | Facility Agreements [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  | $ 150,000 |  |  |  |  |  |  |
Current and Noncurrent Portion [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Financing obligation |  |  | $ 15,000 |  |  |  |  |  |
London Interbank Offered Rate (LIBOR) [Member] | MUFG Bank, Ltd., Singapore Branch [Member] | Facility Agreements [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 1.50% |  |  |  |  |  |  |

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