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Stock Repurchase Program - Additional Information (Detail) - USD ($) | 3 Months Ended | 9 Months Ended | 36 Months Ended |
--- | --- | --- | --- | ---
Sep. 26, 2020 | Jun. 27, 2020 | Mar. 28, 2020 | Sep. 28, 2019 | Jun. 29, 2019 | Sep. 26, 2020 | Sep. 28, 2019 | Jul. 01, 2021 | Sep. 11, 2018
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Stock Repurchase Program, Remaining Authorized Repurchase Amount | $ 4,700,000 |  |  |  |  | $ 4,700,000 |  |  |
Shares repurchased(1) | 0 |  |  | 1,000 |  | 4,000 | 208,000 |  |
Average cost per share | $ 0 |  |  | $ 139.91 |  | $ 164.44 | $ 134.05 |  |
Value of shares repurchased | $ 0 | $ 220,000 | $ 371,000 | $ 70,000 | $ 27,854,000 | $ 591,000 | $ 27,924,000 |  |
2018 Repurchase Program | Common Stock |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Number of common shares authorized to be repurchased under new stock repurchase program |  |  |  |  |  |  |  |  | 5,000,000.0
Forecast [Member] | 2018 Repurchase Program | Common Stock |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Stock Repurchase Program, Period |  |  |  |  |  |  |  | 3 years |

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- Definition Period which shares may be purchased under a stock repurchase plan authorized by an entity's Board of Directors, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Total cost of shares repurchased divided by the total number of shares repurchased. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 + Details
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