Capital Stock - Summary of Shares Repurchase and Cancellation (Detail) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
Dec. 26, 2020	Dec. 28, 2019	Dec. 29, 2018
Common Stock Repurchases [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares repurchased and cancelled	23,360	22,380	26,280
Total cost of shares repurchased and cancelled (in millions)	$ 1.9	$ 1.9	$ 2.0
Average price per share	$ 81.12	$ 87.26	$ 74.79
Share Repurchase Program [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares repurchased and cancelled	439,275	499,564	622,223
Total cost of shares repurchased and cancelled (in millions)	$ 36.8	$ 39.4	$ 43.4
Average price per share	$ 83.73	$ 78.84	$ 69.73

Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(28))
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
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Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
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-Subparagraph (SX 210.5-02(29))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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Balance Type:	debit
Period Type:	duration