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Investments (Details 1) - USD ($) $ in Thousands | Dec. 30, 2017 | Apr. 01, 2017
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Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Amortized Cost Basis | $ 16,392 |
Available-for-Sale Securities by Investment Category |  |
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 4,092 | $ 2,582
Available-for-sale Securities, Amortized Cost Basis | 26,781 | 21,941
Total Amortized Cost - Available-for-sale Securities | 26,781 | 21,941
Gross Unrealized Losses | (386) | (361)
Total Fair Value - Available-for-sale Securities | 30,487 | 24,162
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Fair Value | 16,264 |
Equity Method Investments | 18,646 | 17,383
U.S. Treasury and Government Agencies [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Amortized Cost Basis | 300 |
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Amortized Cost Basis |  | 650
Available-for-Sale Securities by Investment Category |  |
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 0 | 0
Gross Unrealized Losses | (4) | (1)
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Fair Value |  | 649
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Fair Value | 296 |
Mortgage-backed securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Amortized Cost Basis | 7,510 |
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Amortized Cost Basis |  | 5,646
Available-for-Sale Securities by Investment Category |  |
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 1 | 3
Gross Unrealized Losses | (104) | (90)
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Fair Value |  | 5,559
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Fair Value | 7,407 |
States and political subdivisions [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Amortized Cost Basis | 6,924 |
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Amortized Cost Basis |  | 7,195
Available-for-Sale Securities by Investment Category |  |
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 142 | 145
Gross Unrealized Losses | (142) | (117)
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Fair Value |  | 7,223
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Fair Value | 6,924 |
Corporate debt securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Amortized Cost Basis | 1,658 |
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Amortized Cost Basis |  | 1,698
Available-for-Sale Securities by Investment Category |  |
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 2 | 4
Gross Unrealized Losses | (23) | (23)
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Fair Value |  | 1,679
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Fair Value | 1,637 |
Marketable equity securities [Member] |  |
Available-for-Sale Securities by Investment Category |  |
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 3,947 | 2,430
Amortized Cost - Available-for-sale Equity Securities | 7,627 | 5,752
Gross Unrealized Losses | (113) | (130)
Total Fair Value - Available-for-sale Equity Securities | 11,461 | 8,052
Certificates of Deposit [Member] |  |
Available-for-Sale Securities by Investment Category |  |
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 0 | 0
Available-for-sale Securities, Amortized Cost Basis | 2,762 | 1,000
Total Amortized Cost - Available-for-sale Securities | 2,762 | 1,000
Gross Unrealized Losses | 0 | 0
Total Fair Value - Available-for-sale Securities | $ 2,762 | $ 1,000

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