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Performance-Contingent Restricted Stock Awards (Detail) - USD ($) $ in Thousands | 4 Months Ended | 12 Months Ended
--- | --- | ---
Apr. 20, 2019 | Apr. 21, 2018 | Dec. 29, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Dividends at Vesting | $ 1,233 | $ 405 |
Fiscal Year Vested 2018 | 2017 Award |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Dividends at Vesting | 1,219 |  |
Income tax expense related to share-based payments | 936 |  |
Fair Value at Vesting | $ 18,570 |  |
Fiscal Year Vested 2018 | TSR Modifier | 2017 Award |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Shares Increase/(Decrease) | 205,686 |  |
Fiscal Year Vested 2018 | ROIC Modifier | 2017 Award |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Shares Increase/(Decrease) | (97,131) |  |
Fiscal Year Vested 2017 | 2016 Award Granted |  |  |
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 2017 | TSR Modifier | 2016 Award Granted |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Shares Increase/(Decrease) |  |  | (333,112)
Fiscal Year Vested 2017 | ROIC Modifier | 2016 Award Granted |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Shares Increase/(Decrease) |  |  | (114,190)

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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://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) -URI http://asc.fasb.org/extlink&oid=109197908&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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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