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Investments (Details Textual) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Oct. 01, 2016 | Sep. 26, 2015 | Oct. 01, 2016 | Sep. 26, 2015 | Apr. 02, 2016
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | $ (3,729,000) |  | $ (3,729,000) |  | $ (2,630,000)
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 316,000 |  | 316,000 |  | 530,000
Investments (Textual) [Abstract] |  |  |  |  |
Value of investments to be other-than-temporarily impaired | 0 |  |  |  |
Gross gains realized | 208,000 | $ 51,000 | 661,000 | $ 231,000 |
Gross losses realized | (108,000) | $ (66,000) | (257,000) | $ (112,000) |
US Treasury and Government [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 0 |  | 0 |  | 0
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 0 |  | 0 |  | 3,000
Common stock of industrial and other companies [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Fair Value | 8,428,000 |  | 8,428,000 |  | 7,744,000
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | $ (191,000) |  | $ (191,000) |  | (409,000)
Common stock of bank trust, insurance, and public utility companies [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Fair Value |  |  |  |  | 100,000
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax |  |  |  |  | $ (3,000)

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- Definition Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27161-111563 + Details
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- Definition Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27161-111563 + Details
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- Definition This item represents the gross profit realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27357-111563 + Details
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