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Marketable Securities (Tables) | 12 Months Ended
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Dec. 30, 2023
Investments, Debt and Equity Securities [Abstract] |
Schedule Of Marketable Securities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Gross | ​ | Gross | ​ | ​ | ​
(amounts in thousands) | ​ | Amortized | ​ | Unrealized | ​ | Unrealized | ​ | Fair
December 30, 2023 |  | Cost |  | Holding Gains |  | Holding Losses |  | Value
Available-for-sale: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Level 1 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Equity securities | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | $ | 4,910
Level 2 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Corporate and municipal bonds | ​ | $ | 177,972 | ​ | $ | 3,853 | ​ | $ | (6,553) | ​ | ​ | 175,272
Commercial Paper | ​ | ​ | 44,732 | ​ | ​ | 1,076 | ​ | ​ | — | ​ | ​ | 45,808
Total | ​ | $ | 222,704 | ​ | $ | 4,929 | ​ | $ | (6,553) | ​ | $ | 225,991
​ ​ ​ ​ ​ ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ ​ | ​ | ​ | ​ | ​ | ​ ​ | ​ | ​ ​ Gross | ​ | ​ | ​
|  |  |  |  | Gross |  |  |  |  |
(amounts in thousands) | ​ | Amortized | ​ | Unrealized | ​ | Unrealized | ​ | Fair
December 31, 2022 |  | Cost |  | Holding Gains |  | Holding Losses |  | Value
Available-for-sale: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Level 1 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Equity securities | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | $ | 5,185
Level 2 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Corporate and municipal bonds | ​ | $ | 190,025 | ​ | $ | 2,110 | ​ | $ | (10,901) | ​ | ​ | 181,234
Total | ​ | $ | 190,025 | ​ | $ | 2,110 | ​ | $ | (10,901) | ​ | $ | 186,419
​
Schedule Of Maturities Of Marketable Securities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Amortized | ​ | Fair
(amounts in thousands) |  | Cost |  | Value
Available-for-sale: | ​ | ​ | ​ | ​ | ​ | ​
Due within one year | ​ | $ | 93,503 | ​ | $ | 95,188
Due after one year through five years | ​ | ​ | 77,187 | ​ | ​ | 74,573
Due after five years through ten years | ​ | ​ | 16,308 | ​ | ​ | 15,351
Due after ten years | ​ | ​ | 35,706 | ​ | ​ | 35,968
Total | ​ | $ | 222,704 | ​ | $ | 221,080
​

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