Stock Options, Other Stock Awards and Warrants - Stock Options (Details) - Share-based Payment Arrangement, Option - $ / shares shares in Thousands	12 Months Ended
Dec. 27, 2020	Dec. 29, 2019	Dec. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding at beginning of year	2,444	2,310	2,579
Granted (in shares)	829	740	538
Exercised (in shares)	(297)	(546)	(736)
Expired or forfeited (in shares)	(114)	(60)	(71)
Outstanding at end of year	2,862	2,444	2,310
Exercisable at end of year (in shares)	1,451	1,284	1,391
Weighted average exercise price:
Granted (in dollars per share)	$ 96.79	$ 86.66	$ 98.10
Exercised (in dollars per share)	55.82	58.18	45.64
Expired or forfeited (in dollars per share)	94.32	95.71	93.81
Outstanding at end of year (in dollars per share)	88.16	81.58	74.78
Exercisable at end of year (in dollars per share)	$ 82.80	$ 73.03	$ 61.59

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired.

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Weighted average price of options that were either forfeited or expired.

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Net number of share options (or share units) granted during the period.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Number of share options (or share units) exercised during the current period.

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