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Note 5 - Inventories (Details Textual) - USD ($)	3 Months Ended			6 Months Ended
	Sep. 29, 2018	Sep. 29, 2018	Sep. 30, 2017	Sep. 29, 2018	Sep. 30, 2017
Inventory, LIFO Reserve	$ 134,953,000	$ 134,953,000	$ 151,096,000	$ 134,953,000	$ 151,096,000
Inventory, LIFO Reserve, Period Charge	(9,550,000)		10,398,000	(10,054,000)	17,841,000
Modesto Facility [Member] | Discontinued Operations, Held-for-sale [Member]
Inventory, LIFO Reserve, Period Charge			$ (361,000)		$ (654,000)
Effect of LIFO Inventory Liquidation on Income	$ 24,211,000	$ 24,211,000		$ 24,211,000

X

- Definition

The effect of liquidating LIFO (last in first out) inventory layers on income.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 330
-SubTopic 10
-Section S99
-Paragraph 3
-Subparagraph (SAB Topic 11.F)
-URI http://asc.fasb.org/extlink&oid=27011343&loc=d3e100079-122729

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X

- Definition

Amount by which inventory stated at last-in first-out (LIFO) is less than (in excess of) inventory stated at other inventory cost methods.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.6(c))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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X

- Definition

The change in the inventory reserve representing the cumulative difference in cost between the first in, first out and the last in, first out inventory valuation methods, which change has been reflected in the statement of income during the period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
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