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Performance-Contingent Restricted Stock Awards (Detail) - USD ($) $ in Thousands | 4 Months Ended | 12 Months Ended
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Apr. 21, 2018 | Dec. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Dividends at Vesting | $ 405 |
Fiscal Year Vested 2018 | 2016 Award |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Dividends at Vesting | 405 |
Income tax expense related to share-based payments | (2,130) |
Fair Value at Vesting | $ 6,504 |
Fiscal Year Vested 2018 | TSR Modifier | 2016 Award |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Shares Increase/(Decrease) | (333,112) |
Fiscal Year Vested 2018 | ROIC Modifier | 2016 Award |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Shares Increase/(Decrease) | (114,190) |
Fiscal Year Vested 2017 | 2015 Award Granted |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Dividends at Vesting |  | $ 392
Income tax expense related to share-based payments |  | (3,099)
Fair Value at Vesting |  | $ 6,316
Fiscal Year Vested 2017 | TSR Modifier | 2015 Award Granted |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Shares Increase/(Decrease) |  | (378,219)
Fiscal Year Vested 2017 | ROIC Modifier | 2015 Award Granted |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Shares Increase/(Decrease) |  | (49,272)

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- Definition Amount of paid and unpaid cash, stock, and paid-in-kind (PIK) dividends declared and applicable to holders of share-based compensation, for example, but not limited to, non-vested shares, stock options, or restricted stock units. + References No definition available. + Details
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- Definition The net total number of shares (or other type of equity) under an equity-based award plan, other than a stock option plan, that were granted, vested and forfeited during the reporting 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 (c)(2)(iii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash. + 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 (d)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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