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Stock-Based Compensation - Narrative (Detail) - USD ($) $ / shares in Units, $ in Thousands |  |  |  |  |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 01, 2018 | Aug. 02, 2018 | Oct. 02, 2017 | Jul. 13, 2017 | Jul. 14, 2016 | Jul. 29, 2018 | Jul. 30, 2017 | Oct. 28, 2018 | Oct. 29, 2017 | Sep. 16, 2015
Performance Based Restricted Stock Units [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Fair value of vested shares |  |  |  |  |  |  |  |  | $ 3,600 | $ 3,900 |
Remaining unrecognized compensation cost |  |  |  |  |  |  |  |  | $ 1,600 |  |
Weighted average period over which unrecognized compensation cost is expected to be recognized |  |  |  |  |  |  |  |  | 2 years 3 months 18 days |  |
Fair value of units expected to vest |  |  |  |  |  |  |  |  | $ 2,400 |  |
Performance Based Restricted Stock Units [Member] | Employee [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of shares granted | [1],[2] |  | 47,800 |  | 44,000 |  |  |  |  |  |
Vesting Period | [2] |  | 3 years |  | 3 years |  |  |  |  |  |
Price Per Share | [2],[3] |  | $ 24.35 |  | $ 32.50 |  |  |  |  |  |
Time Vested Restricted Stock Units [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Remaining unrecognized compensation cost |  |  |  |  |  |  |  |  | $ 252 |  |
Weighted average period over which unrecognized compensation cost is expected to be recognized |  |  |  |  |  |  |  |  | 4 years 3 months 18 days |  |
Fair value of units expected to vest |  |  |  |  |  |  |  |  | $ 250 |  |
Time Vested Restricted Stock Units [Member] | Employee [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Fair value of vested shares |  |  |  |  |  |  | $ 39 | $ 34 |  |  |
Number of shares granted |  |  | 11,200 |  | 1,200 | 1,200 |  |  |  |  |
Vesting Period |  |  |  |  | 11 months | 11 months |  |  |  |  |
Price Per Share |  |  | $ 24.35 |  | $ 32.50 | $ 28 |  |  |  |  |
Number of shares vested |  |  |  |  |  |  | 1,200 | 1,200 |  |  |
Weighted average fair value of vested shares, per share |  |  |  |  |  |  | $ 32.50 | $ 28 |  |  |
Time Vested Restricted Stock Units [Member] | Employee [Member] | Requisite Service Period for 10,000 Restricted Stock Units [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of shares granted |  |  | 10,000 |  |  |  |  |  |  |  |
Vesting Period |  |  | 59 months |  |  |  |  |  |  |  |
Time Vested Restricted Stock Units [Member] | Employee [Member] | Requisite Service Period for 1,200 Restricted Stock Units [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of shares granted |  |  | 1,200 |  |  |  |  |  |  |  |
Vesting Period |  |  | 11 months |  |  |  |  |  |  |  |
Common Stock Awards [Member] | Outside Directors [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of shares granted |  | 3,600 |  | 4,800 |  |  |  |  |  |  |
Price Per Share |  | $ 23.45 |  | $ 33.20 |  |  |  |  |  |  |
Selling, General and Administrative Expenses [Member] | Performance Based Restricted Stock Units [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Share-based compensation expense |  |  |  |  |  |  |  |  | (216) | 1,400 |
Selling, General and Administrative Expenses [Member] | Time Vested Restricted Stock Units [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Share-based compensation expense |  |  |  |  |  |  |  |  | 26 | 17 |
Selling, General and Administrative Expenses [Member] | Common Stock Awards [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Share-based compensation expense |  |  |  |  |  |  |  |  | $ 84,000 | $ 159,000 |
2015 Equity Incentive Plan [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of common stock authorized for issuance |  |  |  |  |  |  |  |  |  |  | 1,200,000
Number of shares available for future equity based grants |  |  |  |  |  |  |  |  | 941,528 |  |
2007 Equity Incentive Plan [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of shares available for future equity based grants |  |  |  |  |  |  |  |  |  |  | 0
[1] | Amounts represent the maximum number of common stock shares that could be earned if certain performance targets are met as defined in the related restricted stock unit agreements.
[2] | Performance-based restricted stock units awarded to key employees.
[3] | Price per share represents the closing price of our common stock on the date of grant.

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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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