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SUPPLEMENTAL BALANCE SHEET INFORMATION (Details) - USD ($) $ in Thousands	Jun. 26, 2021	Dec. 26, 2020	Jun. 27, 2020
Composition of trade receivables
Client receivables	$ 480,533	$ 489,042
Unbilled revenue	171,032	135,400
Total	651,565	624,442
Less: Allowance for doubtful accounts	(7,538)	(6,702)
Trade receivables and contract assets, net	644,027	617,740
Composition of inventories
Raw materials and supplies	32,071	28,317
Work in process	28,314	36,755
Finished products	133,956	120,623
Inventories	194,341	185,695
Composition of other current assets
Prepaid income tax	117,811	68,462
Short-term investments	1,037	1,024
Restricted cash	3,118	3,074	$ 465
Other current assets	121,966	72,560
Composition of other assets
Venture capital investments	174,420	197,100
Strategic equity investments	39,342	24,704
Life insurance policies	48,715	43,827
Other long-term income tax assets	23,153	23,485
Restricted cash	1,403	1,621	$ 1,557
Long-term pension assets	34,362	31,915
Other	36,399	29,974
Other assets	357,794	352,626
Composition of other current liabilities
Current portion of operating lease right-of-use liabilities	31,741	24,674
Accrued income taxes	39,066	24,884
Customer contract deposits	44,981	42,244
Other	16,511	10,675
Other current liabilities	132,299	102,477
Composition of other long-term liabilities
U.S. Transition Tax	43,057	48,781
Long-term pension liability, accrued executive supplemental life insurance retirement plan and deferred compensation plan	75,221	74,233
Long-term deferred revenue	18,256	19,475
Other	70,843	62,726
Other long-term liabilities	$ 207,377	$ 205,215

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