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PENSION PLANS (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 29, 2018 | Jun. 30, 2017 | Jun. 29, 2018 | Jun. 30, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Operating expenses | $ 47,378 | $ 45,893 | $ 137,345 | $ 126,441
Pension plan contributions | 47 | 1,043 | 5,140 | 1,308
Components of net periodic benefit cost: |  |  |  |
Service cost | 0 | 0 | 0 | 0
Interest on projected benefit obligation | 272 | 215 | 794 | 783
Less estimated return on plan assets | (25) | 347 | 572 | 895
Amortization of unrecognized losses | 50 | 265 | 415 | 548
Net periodic benefit cost | 347 | $ 133 | 637 | $ 436
Accounting Standards Update 2017-07 |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Operating expenses | (347) |  | (637) |
Other expenses | $ 347 |  | $ 637 |

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- Definition Amount of expected return (loss) recognized in net periodic benefit (cost) credit, calculated based on expected long-term rate of return and market-related value of plan assets of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(3) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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