Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Oct. 29, 2011	Oct. 30, 2010
Cash Flows From Operating Activities:
Net income	$ 24,558	$ 22,260
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	5,408	5,980
Deferred income tax benefit	(285)	(209)
Gain on disposal of property, net	(5)	(4)
Stock-based compensation	130	196
Changes in assets and liabilities:
Trade receivables	4,504	6,526
Inventories	(4,948)	2,387
Prepaid and other assets	(673)	549
Accounts payable	(6,492)	(6,784)
Accrued and other liabilities	(4,076)	(1,032)
Net cash provided by operating activities	18,121	29,869
Cash Flows From Investing Activities:
Additions to property, plant and equipment	(3,783)	(4,136)
Proceeds from sale of property, plant and equipment	19	10
Net cash used in investing activities	(3,764)	(4,126)
Cash Flows From Financing Activities:
Proceeds from stock options exercised	88	24
Stock-based tax benefits	126	30
Net cash provided by financing activities	214	54
Net Increase in Cash and Equivalents	14,571	25,797
Cash and Equivalents - Beginning of Year	7,372	68,566
Cash and Equivalents - End of Period	21,943	94,363
Other Cash Flow Information:
Interest paid	38	52
Income taxes paid	$ 12,349	$ 13,331