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BUSINESS ACQUISITIONS (Narrative) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Dec. 25, 2021
Dec. 26, 2020
Dec. 25, 2021
Dec. 26, 2020
Business Acquisition [Line Items]        
Revenue contibution $ 50,902 $ 44,062 $ 149,079 $ 124,573
Operating loss (2,361) $ (2,519) $ (9,628) (6,561)
Tangent [Member]        
Business Acquisition [Line Items]        
Date of acquisition     Dec. 31, 2021  
Purchase price allocation description     The purchase price allocation has not been finalized, due to the timing of the acquisition date and the filing date of this Quarterly Report on Form 10-Q. Therefore, the allocation of the purchase price to the assets acquired and liabilities assumed, including values to be recognized for goodwill and other intangible assets, will be disclosed in the Annual Report on Form 10-K for the fiscal year ending March 26, 2022. The pro forma results of operations from the Tangent acquisition, will be disclosed in the Annual Report on Form 10-K for the fiscal year ending March 26, 2022. The goodwill related to Tangent is not expected to be deductible for income tax purposes. All of the goodwill and intangible assets relating to the Tangent acquisition will be allocated to the Service segment.  
Cash paid for acquisition     $ 9,000  
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.  
Purchase price held in escrow as holdback     $ 100  
Cash paid for acquisition     $ 23,900  
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     $ 2,900  
Estimated fair value of contingent earn-out payments 200   200  
Nexa [Member] | Minimum [Member]        
Business Acquisition [Line Items]        
Operating loss     $ 300  
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     $ 900 $ 100