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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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