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Shareholders' Equity (Narrative) (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 30, 2018 | Nov. 30, 2017
Two Thousand Seventeen Stock Repurchase Program [Member] |  |
Equity, Class of Stock [Line Items] |  |
Stock repurchase program approved amount |  | $ 600.0
Stock Repurchase Program, Remaining Authorized Repurchase Amount | $ 392.2 |
Retained Earnings [Member] |  |
Equity, Class of Stock [Line Items] |  |
Stock Repurchased During Period, Value | $ 42.5 |
Open Market Purchases [Member] | Two Thousand Seventeen Stock Repurchase Program [Member] |  |
Equity, Class of Stock [Line Items] |  |
Stock Repurchased During Period, Shares | 1.3 |
Accelerated Share Repurchases, Final Price Paid Per Share | $ 39.43 |
Stock Repurchased During Period, Value | $ 50.0 |

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- Definition Final price paid per share for the purchase of the targeted number of shares, determined by an average market price over a fixed period of time. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 25 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6405686&loc=d3e22802-112653 + Details
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