BUSINESS ACQUISITIONS (Purchase Price Paid for Businesses Acquired) (Details) - USD ($) $ in Thousands	Dec. 26, 2020	Mar. 28, 2020
Allocation of Purchase Price:
Goodwill	$ 43,945	$ 41,540
BioTek Services, Inc. [Member]
Allocation of Purchase Price:
Goodwill	1,927
Total	3,093
Plus: Current Assets	406
Non-Current Assets	8
Less: Current Liabilities	(60)
Total Purchase Price	3,447
TTE Laboratories, Inc. [Member]
Allocation of Purchase Price:
Goodwill	6,751
Total	11,281
Plus: Current Assets	928
Non-Current Assets	261
Less: Current Liabilities	(239)
Total Purchase Price	12,231
Customer Base & Contracts [Member] | BioTek Services, Inc. [Member]
Allocation of Purchase Price:
Intangible Assets	1,066
Customer Base & Contracts [Member] | TTE Laboratories, Inc. [Member]
Allocation of Purchase Price:
Intangible Assets	4,410
Covenant Not to Compete [Member] | BioTek Services, Inc. [Member]
Allocation of Purchase Price:
Intangible Assets	100
Covenant Not to Compete [Member] | TTE Laboratories, Inc. [Member]
Allocation of Purchase Price:
Intangible Assets	$ 120