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Shareholders' Equity (Narrative) (Details) - USD ($) $ / shares in Units, shares in Thousands |  | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jul. 03, 2021 | Jul. 02, 2021 | Apr. 02, 2021 | Jun. 26, 2020 | Mar. 27, 2020 | Jul. 02, 2021 | Jun. 26, 2020 | Jan. 01, 2021
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |
Total cost |  | $ 8,603,000 | $ 2,110,000 |  | $ 1,006,000 |  |  |
Amount available under repurchase plan |  | 13,600,000 |  |  |  | $ 13,600,000 |  |
Stock repurchase authorized |  | $ 167,200,000 |  |  |  | $ 167,200,000 |  |
Shares repurchased for employee net vesting obligations, shares |  | 2 |  | 2 |  | 110 | 127 |
Shares repurchased for employee net vesting obligations, value |  | $ 38,000 |  | $ 25,000 |  | $ 1,600,000 | $ 2,000,000.0 |
Dividend declared |  |  | $ 0.40 |  |  |  |  |
Dividend payment |  | $ 3,227,000 | $ 3,254,000 | $ 3,050,000 | $ 13,000 |  |  |
Dividends payable, date declared, year |  | 2021 |  |  |  | 2021 |  |
Dividends payable, date to be paid, year and month |  | 2021-10 |  |  |  | 2021-10 |  |
Minimum [Member] |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |
Dividend declared |  |  |  |  |  |  |  | $ 0.36
Maximum [Member] |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |
Dividend declared |  |  |  |  |  |  |  | $ 0.38
Subsequent Event [Member] |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |
Amount available under repurchase plan | $ 13,200,000 |  |  |  |  |  |  |
Share Repurchase Plan [Member] |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |
Repurchase of common stock |  | 489 |  | 73 |  | 626 | 73 |
Purchase price per share |  | $ 17.58 |  | $ 13.79 |  | $ 17.11 | $ 13.79 |
Total cost |  | $ 8,600,000 |  | $ 1,000,000.0 |  | $ 10,700,000 | $ 1,000,000.0 |
Share Repurchase Plan [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |
Repurchase of common stock | 22 |  |  |  |  |  |  |
Purchase price per share | $ 17.98 |  |  |  |  |  |  |
Total cost | $ 400,000 |  |  |  |  |  |  |
Stock Appreciation Rights ("SARs") [Member] |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |
SARs outstanding |  | 2,900 |  |  |  | 2,900 |  |
Exercise price |  | $ 4.00 |  |  |  | $ 4.00 |  |
Expiration date |  |  |  |  |  | Feb. 08, 2022 |  |

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