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Stock-Based Compensation Expense (Detail) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 USD ($) group $ / shares shares | Apr. 01, 2018 USD ($) | Oct. 01, 2017 USD ($) $ / shares | Apr. 02, 2017 USD ($) | Sep. 30, 2018 USD ($) group $ / shares shares | Oct. 01, 2017 USD ($) $ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Vesting period, performance-based restricted stock, years |  |  |  |  | 1 year |
Vesting period, time-based restricted stock, years |  |  |  |  | 3 years |
Groups within the employee population | group | 2 |  |  |  | 2 |
Estimated annual forfeiture rate for unvested options for senior management | 8.00% |  |  |  | 8.00% |
Estimated annual forfeiture rate for unvested options for all other employees | 12.00% |  |  |  | 12.00% |
Increase (decrease) to compensation expense |  | $ 1,283,000 |  | $ 673,000 |  |
Weighted-average grant-date fair values, in dollars per share | $ / shares | $ 22.52 |  | $ 14.80 |  | $ 21.70 | $ 14.97
Total intrinsic value | $ 17,985,000 |  | $ 28,462,000 |  | $ 50,975,000 | $ 100,913,000
Total fair values of stock options vest | 997,000 |  | 844,000 |  | 27,557,000 | 19,557,000
Unrecognized compensation expense | 50,387,000 |  |  |  | $ 50,387,000 |
Weighted average period to be recognized |  |  |  |  | 1 year 7 months 10 days |
Stock-based compensation expense | 9,143,000 |  | 8,026,000 |  | $ 31,339,000 | 23,355,000
Tax benefit from compensation expense | 1,654,000 |  | $ 2,639,000 |  | 5,608,000 | $ 7,661,000
Recognized period costs capitalized | $ 0 |  |  |  | $ 0 |
General Stock Option Plan |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Vesting period for stock option plans |  |  |  |  | 4 years |
Employee Stock Option |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Shares available for grant under stock option plans | shares | 20,246,002 |  |  |  | 20,246,002 |
Expiration period from grant day |  |  |  |  | 10 years |

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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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