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Stock-Based Compensation - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Dec. 30, 2018 | Dec. 31, 2017 | Jan. 01, 2017 | Apr. 01, 2018 | Feb. 14, 2018 | Feb. 15, 2017 | Feb. 17, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Plan activity adjustment period - Evergreen provision | 5 years |  |  |  |  |  |
Number of shares available for grant (in shares) - Fixed provision | 4,000,000 |  |  |  |  |  |
Tax benefit | $ 4.4 | $ 4.2 | $ 3.9 |  |  |  |
Restricted Stock |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Award vesting period | 4 years |  |  |  |  |  |
Unrecognized compensation cost, unvested restricted stock | $ 6.1 |  |  |  |  |  |
Compensation cost not yet recognized, period for recognition | 1 year 9 months 18 days |  |  |  |  |  |
Grants in period (in dollars per share) | $ 28.79 | $ 21.97 | $ 17.08 |  |  |  |
Vested in period, fair value | $ 4.9 | $ 5.8 | $ 6.4 |  |  |  |
Granted (in shares) | 157,000 |  |  |  |  |  |
Weighted average grant date fair value (in dollars per share) | $ 23.44 | $ 18.76 |  |  |  |  |
Total nonvested shares (in shares) | 356,000 | 440,000 |  |  |  |  |
Performance Shares |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Granted (in shares) | 222,000 | 387,000 | 332,000 |  |  |  |
Performance Shares, Financial Goals |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Unrecognized compensation cost, unvested restricted stock | $ 2.1 |  |  |  |  |  |
Compensation cost not yet recognized, period for recognition | 1 year 8 months 12 days |  |  |  |  |  |
Vested in period, fair value | $ 7.7 |  |  |  |  |  |
Granted (in shares) | 118,000 | 203,000 | 249,000 |  |  |  |
Performance measurement period | 3 years | 3 years | 3 years |  |  |  |
Weighted average grant date fair value (in dollars per share) |  |  |  |  | $ 28.40 | $ 21.07 | $ 15.85
Performance Shares, Total Shareholder Return |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Unrecognized compensation cost, unvested restricted stock | $ 1.6 |  |  |  |  |  |
Compensation cost not yet recognized, period for recognition | 1 year 8 months 12 days |  |  |  |  |  |
Grants in period (in dollars per share) | $ 31.38 |  |  |  |  |  |
Vested in period, fair value | $ 6.3 |  |  |  |  |  |
Granted (in shares) | 59,000 | 101,000 | 83,000 |  |  |  |
Performance measurement period | 3 years | 3 years | 3 years |  |  |  |
Weighted average grant date fair value (in dollars per share) | $ 23.56 | $ 18.17 |  |  |  |  |
Total nonvested shares (in shares) | 173,000 | 240,000 |  |  |  |  |
Performance Shares, Total Shareholder Return | Monte Carlo Fair Value |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Weighted average grant date fair value (in dollars per share) |  |  |  |  | $ 31.38 | $ 20.16 | $ 19.73
Performance Shares, Single Financial Goal |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Award vesting period | 4 years | 4 years |  |  |  |  |
Granted (in shares) | 45,000 | 83,000 |  |  |  |  |
Performance measurement period | 1 year | 1 year |  |  |  |  |
Stock-based compensation cost |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Stock-based compensation cost | $ 8.1 | $ 9.1 | $ 10.2 |  |  |  |
Class A common stock |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Maximum number of shares available for grants - Evergreen provision | 15.00% |  |  |  |  |  |
Maximum number of shares available for grants - Fixed provision | 4,700,000 |  |  |  |  |  |
Performance shares eligible to earn more than target | Performance Shares |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Granted (in shares) | 177,000 | 304,000 |  |  |  |  |
Maximum shares eligible to earn | Performance Shares |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Granted (in shares) | 355,000 | 609,000 | 663,000 |  |  |  |
Maximum target percentage allowed under grant | 200.00% | 200.00% | 200.00% |  |  |  |
Maximum shares eligible to earn | Performance Shares, Financial Goals |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Maximum target percentage allowed under grant | 200.00% | 200.00% | 200.00% |  |  |  |
Maximum shares eligible to earn | Performance Shares, Total Shareholder Return |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Maximum target percentage allowed under grant | 200.00% | 200.00% | 200.00% |  |  |  |
2018 grant | Performance Shares, Financial Goals |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Weighted average grant date fair value (in dollars per share) | $ 19.41 |  |  |  |  |  |
Total nonvested shares (in shares) | 219,000 |  |  |  |  |  |
2018 grant | Performance Shares, Total Shareholder Return |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Total nonvested shares (in shares) | 109,000 |  |  |  |  |  |
2017 grant | Performance Shares, Financial Goals |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Weighted average grant date fair value (in dollars per share) | $ 19.41 |  |  |  |  |  |
Total nonvested shares (in shares) | 254,000 |  |  |  |  |  |
2017 grant | Performance Shares, Total Shareholder Return |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Total nonvested shares (in shares) | 127,000 |  |  |  |  |  |
2016 grant | Performance Shares, Financial Goals |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Weighted average grant date fair value (in dollars per share) |  |  |  | $ 28.40 |  |  |
Total nonvested shares (in shares) | 117,000 |  |  |  |  |  |
Actual percentage achieved | 70.00% |  |  |  |  |  |
2016 grant | Performance Shares, Total Shareholder Return |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Total nonvested shares (in shares) | 57,000 |  |  |  |  |  |
Actual percentage achieved | 104.00% |  |  |  |  |  |

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5047-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -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=109197908&loc=d3e5070-113901 + Details
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- Definition Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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