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General and Summary of Significant Accounting Policies - Narrative (Detail)	9 Months Ended	12 Months Ended
	Jan. 31, 2021	Apr. 30, 2023 USD ($) Segment	May 01, 2022 USD ($)	May 02, 2021 USD ($)	Feb. 01, 2021	Jan. 01, 2017
Organization And Summary Of Significant Accounting Policies [Line Items]
Number of Operating Segments | Segment		2
Non-cash inventory charges		$ 5,819,000	$ 1,927,000	$ 882,000
Rabbi trust investments		8,500,000	9,400,000
Interest costs incurred on lines of credit		0	17,000	51,000
Interest cost capitalized		0	0	0
Asset impairment charges		$ 0	$ 0	0
Dividends received deduction percentage for earnings and profits received from foreign corporation		100.00%	100.00%
Dividends received deduction, foreign corporation ownership percentage		10.00%	10.00%
Selling, general and administrative expenses		$ 37,978,000	$ 35,415,000	37,756,000
Shipping and Handling [Member]
Organization And Summary Of Significant Accounting Policies [Line Items]
Selling, general and administrative expenses		4,200,000	4,300,000	$ 3,900,000
Rabbi Trust Investments [Member]
Organization And Summary Of Significant Accounting Policies [Line Items]
Unrealized gain (loss) on investments		$ 19,000	$ 32,000
CIH [Member]
Organization And Summary Of Significant Accounting Policies [Line Items]
Equity method investment, ownership percentage						50.00%
CIH [Member]
Organization And Summary Of Significant Accounting Policies [Line Items]
Acquisition of additional ownership percentage				50.00%	50.00%	50.00%
Majority ownership percentage acquired					100.00%
Percentage of share earnings and losses	50.00%

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