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General and Summary of Significant Accounting Policies (Detail) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Apr. 29, 2018 USD ($) | Jan. 28, 2018 USD ($) | Oct. 29, 2017 USD ($) | Jul. 30, 2017 USD ($) | Apr. 30, 2017 USD ($) | Jan. 29, 2017 USD ($) | Oct. 30, 2016 USD ($) | Jul. 31, 2016 USD ($) | Apr. 28, 2019 | Apr. 29, 2018 USD ($) Segment | Apr. 30, 2017 USD ($) | May 01, 2016 USD ($) | Jan. 01, 2017
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of business segments | Segment |  |  |  |  |  |  |  |  |  | 2 |  |  |
Short-term investments | $ 2,451,000 |  |  |  | $ 2,443,000 |  |  |  |  | $ 2,451,000 | $ 2,443,000 |  |
long-term investments - rabbi trust | 7,326,000 |  |  |  | 5,466,000 |  |  |  |  | 7,326,000 | 5,466,000 |  |
purchase of long-term investments (held-to-maturity) |  |  |  |  |  |  | $ 31,000,000 |  |  |  | 31,020,000 |  |
Amortized cost of held-to-maturity investments | 30,800,000 |  |  |  | 30,900,000 |  |  |  |  | 30,800,000 | 30,900,000 |  |
Fair value of held-to-maturity investments | 30,600,000 |  |  |  | 30,800,000 |  |  |  |  | $ 30,600,000 | 30,800,000 |  |
Inventory aging categories |  |  |  |  |  |  |  |  |  | Inventory aging categories are six, nine, twelve, and fifteen months |  |  |
Interest costs incurred on long-term debt and lines of credit |  |  |  |  |  |  |  |  |  | $ 194,000 | 158,000 | $ 58,000 |
Interest cost capitalized |  |  |  |  |  |  |  |  |  | 100,000 | 158,000 | 58,000 |
Income taxes | (6,217,000) | $ 8,208,000 | $ 2,108,000 | $ 1,640,000 | 778,000 | $ 643,000 | $ 2,684,000 | $ 3,233,000 |  | 5,740,000 | 7,339,000 | 10,963,000 |
Net cash provided by operating activities |  |  |  |  |  |  |  |  |  | 27,473,000 | 34,067,000 | 28,383,000 |
Net cash provided by financing activities |  |  |  |  |  |  |  |  |  | (12,012,000) | (7,724,000) | (13,418,000) |
ASU No. 2016-09 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Income taxes |  |  |  |  |  |  |  |  |  | (497,000) |  |  |
Selling, General and Administrative Expenses [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Handling costs |  |  |  |  |  |  |  |  |  | 4,600,000 | 4,600,000 | 4,200,000 |
Scenario, Forecast [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends received deduction percentage for earnings and profits received from foreign corporation |  |  |  |  |  |  |  |  | 100.00% |  |  |  |
Dividends received deduction, foreign corporation ownership percentage |  |  |  |  |  |  |  |  | 10.00% |  |  |  |
Short-term Investments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Unrealized gain (loss) on investments | (91,000) |  |  |  | (47,000) |  |  |  |  | (91,000) | (47,000) |  |
Long-term Investments (Rabbi Trust) [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Unrealized gain (loss) on investments | $ 61,000 |  |  |  | $ 43,000 |  |  |  |  | $ 61,000 | 43,000 |  |
Excess Tax Benefits from Stock Based Compensation Expense [Member] | ASU No. 2016-09 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Net cash provided by operating activities |  |  |  |  |  |  |  |  |  |  | 657,000 | 841,000 |
Net cash provided by financing activities |  |  |  |  |  |  |  |  |  |  | (657,000) | (841,000) |
Common Stock Shares Withheld to Satisfy Statutory Income Tax Withholding Obligation [Member] | ASU No. 2016-09 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Net cash provided by operating activities |  |  |  |  |  |  |  |  |  |  | 429,000 | 747,000 |
Net cash provided by financing activities |  |  |  |  |  |  |  |  |  |  | $ (429,000) | $ (747,000) |
Maximum [Member] | Investments (Held-To-Maturity) [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Investment maturity period |  |  |  |  |  |  |  |  |  | 2 years 6 months |  |  |
Minimum [Member] | Investments (Held-To-Maturity) [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Investment maturity period |  |  |  |  |  |  |  |  |  | 2 years |  |  |
CLIH [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Equity method investment, ownership percentage | 50.00% |  |  |  |  |  |  |  |  | 50.00% |  |  | 50.00%

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