SUPPLEMENTAL BALANCE SHEET INFORMATION (Details) - USD ($) $ in Thousands	Mar. 30, 2019	Dec. 30, 2018	Dec. 29, 2018	Mar. 31, 2018
Composition of trade receivables
Client receivables	$ 377,188		$ 370,131
Contract assets (unbilled revenue)	120,607		105,216
Total	497,795		475,347
Less: Allowance for doubtful accounts	(2,294)		(3,099)
Trade receivables, net	495,501		472,248
Composition of inventories
Raw materials and supplies	22,118		22,378
Work in process	20,710		21,732
Finished products	86,937		83,782
Inventories	129,765		127,892
Composition of other current assets
Prepaid income tax	54,153		47,157
Investments	907		885
Restricted cash	491		465	$ 605
Other	500		300
Other current assets	56,051		48,807
Composition of other assets
Venture capital investments	100,666		88,591
Life insurance policies	34,939		32,340
Restricted cash	1,499		1,411	$ 2,021
Other	20,901		21,417
Other assets	158,005	$ 138,770	143,759
Composition of other current liabilities
Current portion of right-of-use liabilities-operating leases	18,912
Accrued income taxes	25,725		24,120
Customer contract deposits	32,380		38,245
Other	14,455		8,915
Other current liabilities	91,472	$ 87,215	71,280
Composition of other long-term liabilities
U.S. Transition Tax	52,066		52,064
Long-term pension liability	24,589		24,671
Accrued executive supplemental life insurance retirement plan	36,522		36,086
Long-term deferred revenue	28,819		34,420
Other	31,566		31,880
Other long-term liabilities	$ 173,562		$ 179,121