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BUSINESS ACQUISITIONS (Narrative) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Sep. 25, 2021
Sep. 26, 2020
Sep. 25, 2021
Sep. 26, 2020
Business Acquisition [Line Items]        
Revenue contibution $ 50,387 $ 41,607 $ 98,177 $ 80,511
Operating loss 3,578 $ 3,078 $ 7,267 4,042
Nexa [Member]        
Business Acquisition [Line Items]        
Date of acquisition     Aug. 31, 2021  
Purchase price allocation description     The NEXA goodwill is primarily attributable to the workforce acquired, as well as operational synergies and other intangibles that do not qualify for separate recognition. All of the goodwill and intangible assets relating to the NEXA acquisition has been allocated to the Service segment. Intangible assets related to the NEXA acquisition are being amortized for financial reporting purposes on an accelerated basis over the estimated useful life of up to five years and are deductible for tax purposes. Amortization of goodwill related to the NEXA acquisition is not deductible for tax purposes.  
Unpaid amounts for other holdbacks 100   $ 100  
Cash paid for acquisition     $ 24,100  
Shares issue for acquisition     34,943  
Shares issue value assigned     $ 2,400  
Eearn-out payments 7,500   $ 7,500  
Number of years for earn-out payments     4 years  
Revenue contibution     $ 600  
Estimated fair value of contingent earn-out payments 200   200  
Nexa [Member] | Minimum [Member]        
Business Acquisition [Line Items]        
Operating loss     $ 100  
Upstate Metrology [Member]        
Business Acquisition [Line Items]        
Date of acquisition     Apr. 29, 2021  
Purchase price allocation description     All of the goodwill related to the Upstate Metrology acquisition has been allocated to the Service segment. Amortization of goodwill related to the Upstate Metrology acquisition is deductible for tax purposes.  
BioTek Services, Inc. [Member]        
Business Acquisition [Line Items]        
Date of acquisition     Dec. 16, 2020  
Purchase price allocation description     All of the goodwill and intangible assets relating to the BioTek acquisition has been allocated to the Service segment. Intangible assets related to the BioTek acquisition are being amortized for financial reporting purposes on an accelerated basis over the estimated useful life of up to 10 years and are deductible for tax purposes. Amortization of goodwill related to the BioTek acquisition is deductible for tax purposes.  
Purchase price held in escrow as holdback     $ 400  
Unpaid amounts for other holdbacks 100   100  
Estimated fair value of contingent earn-out payments $ 200   200  
Acquisition costs     $ 800 $ 100