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Stock-Based Compensation Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
--- | ---
Dec. 30, 2017 | Dec. 31, 2016 | Jan. 02, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock-based compensation expense | $ 25.4 | $ 22.8 | $ 18.7
Income tax benefits for grants | $ 8.6 | 7.9 | 6.1
Maximum expiry period of options granted from the grant date | 10 years |  |
Vesting period of options granted | 3 years |  |
Lapsing period of restrictions related to restricted stock issued | three- to four-year |  |
Total pretax intrinsic value of options exercised | $ 12.5 | $ 4.0 | 14.5
Closing stock price | $ 31.88 |  |
Stock options exercisable and in-the-money, number | 4,563,527 | 3,546,676 |
Stock options exercisable and in-the-money, weighted average exercise price | $ 20.26 | $ 16.81 |
Available For Issuance [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock incentive units | 2,673,893 |  |
Option Or Stock Appreciation Right [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock incentive units | 1.0 |  |
Non-Stock Option Awards [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock incentive units | 2.6 |  |
Employee Stock Option [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Unrecognized compensation expense related to nonvested shares and stock option grants | $ 1.8 | $ 4.8 | $ 4.6
Weighted-average period of recognition | 1 year | 1 year 4 months 24 days | 1 year 2 months 12 days
Restricted Awards [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Unrecognized compensation expense related to nonvested shares and stock option grants | $ 18.3 | $ 16.6 | $ 17.2
Weighted-average period of recognition | 1 year 9 months 18 days | 2 years 1 month 6 days | 1 year 10 months 24 days
Total fair value of shares vested | $ 10.6 | $ 7.7 | $ 11.1
Performance Awards [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Unrecognized compensation expense related to nonvested shares and stock option grants | $ 16.9 | $ 8.2 | $ 4.5
Weighted-average period of recognition | 1 year 10 months 24 days | 1 year 9 months 18 days | 2 years
Total fair value of shares vested | $ 4.0 | $ 5.2 | $ 8.7

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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 + Details
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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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