BASIS OF PRESENTATION (Recent Accounting Pronouncements) (Narrative) (Details) - USD ($) $ in Thousands	Mar. 28, 2020	Sep. 29, 2019	Sep. 28, 2019	Sep. 29, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease liabilities	$ 23,786
Operating lease, right-of-use asset	22,692		$ 0
Property, plant and equipment, net	$ 55,647		72,370
Cumulative effect of accounting changes			(769)	$ 534
Accounting Standards Update 2016-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease liabilities		$ 23,800
Operating lease, right-of-use asset		22,200
Financing obligation		(14,500)
Property, plant and equipment, net		(15,300)
Cumulative effect of accounting changes		$ (800)
Retained Earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect of accounting changes			$ (769)	$ 534