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Investments | 12 Months Ended
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Mar. 31, 2018
Investments, Debt and Equity Securities [Abstract] |
Investments | 3. Investments Investments consist of the following (in thousands):
| March 31, 2018 |  | April 1, 2017
Available-for-sale investment securities | $ | 26,586 |  |  | $ | 24,162 |
Non-marketable equity investments | 18,853 |  |  | 17,383 |
| $ | 45,439 |  |  | $ | 41,545 |
The Company's investments in available-for-sale marketable securities consist of investments in common stock of industrial and other companies. Non-marketable equity investments includes $15.0 million as of March 31, 2018 and April 1, 2017, of contributions to equity-method investments in community-based initiatives that buy and sell our homes and provide home-only financing to residents of certain manufactured home communities. Other non-marketable investments include investments in other distribution operations. We record investments in equity and fixed maturity securities classified as available-for-sale at fair value and record the difference between fair value and cost in other comprehensive income. The following tables summarize the Company's available-for-sale investment securities, gross unrealized gains and losses and fair value, aggregated by investment category (in thousands):
| March 31, 2018
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
U.S. Treasury and government debt securities | $ | 300 |  |  | $ | — |  |  | $ | (7 | ) |  | $ | 293 |
Residential mortgage-backed securities | 7,654 |  |  | — |  |  | (155 | ) |  | 7,499 |
State and political subdivision debt securities | 6,377 |  |  | 109 |  |  | (149 | ) |  | 6,337 |
Corporate debt securities | 2,081 |  |  | 1 |  |  | (30 | ) |  | 2,052 |
Marketable equity securities | 6,533 |  |  | 2,435 |  |  | (273 | ) |  | 8,695 |
Certificates of deposit | 1,710 |  |  | — |  |  | — |  |  | 1,710 |
| $ | 24,655 |  |  | $ | 2,545 |  |  | $ | (614 | ) |  | $ | 26,586 |
| April 1, 2017
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
U.S. Treasury and government debt securities | $ | 650 |  |  | $ | — |  |  | $ | (1 | ) |  | $ | 649 |
Residential mortgage-backed securities | 5,646 |  |  | 3 |  |  | (90 | ) |  | 5,559 |
State and political subdivision debt securities | 7,195 |  |  | 145 |  |  | (117 | ) |  | 7,223 |
Corporate debt securities | 1,698 |  |  | 4 |  |  | (23 | ) |  | 1,679 |
Marketable equity securities | 5,752 |  |  | 2,430 |  |  | (130 | ) |  | 8,052 |
Certificates of deposit | 1,000 |  |  | — |  |  | — |  |  | 1,000 |
| $ | 21,941 |  |  | $ | 2,582 |  |  | $ | (361 | ) |  | $ | 24,162 |
The following tables show the gross unrealized losses and fair value, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position (in thousands):
| March 31, 2018
| Less than 12 Months |  | 12 Months or Longer |  | Total
| Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses
U.S. Treasury and government debt securities | $ | 293 |  |  | $ | (7 | ) |  | $ | — |  |  | $ | — |  |  | $ | 293 |  |  | $ | (7 | )
Residential mortgage-backed securities | 3,185 |  |  | (52 | ) |  | 3,909 |  |  | (103 | ) |  | 7,094 |  |  | (155 | )
State and political subdivision debt securities | 2,224 |  |  | (40 | ) |  | 2,180 |  |  | (109 | ) |  | 4,404 |  |  | (149 | )
Corporate debt securities | 1,384 |  |  | (12 | ) |  | 367 |  |  | (18 | ) |  | 1,751 |  |  | (30 | )
Marketable equity securities | 2,550 |  |  | (268 | ) |  | 15 |  |  | (5 | ) |  | 2,565 |  |  | (273 | )
| $ | 9,636 |  |  | $ | (379 | ) |  | $ | 6,471 |  |  | $ | (235 | ) |  | $ | 16,107 |  |  | $ | (614 | )
| April 1, 2017
| Less than 12 Months |  | 12 Months or Longer |  | Total
| Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses
U.S. Treasury and government debt securities | $ | 349 |  |  | $ | (1 | ) |  | $ | — |  |  | $ | — |  |  | $ | 349 |  |  | $ | (1 | )
Residential mortgage-backed securities | 3,449 |  |  | (38 | ) |  | 1,962 |  |  | (52 | ) |  | 5,411 |  |  | (90 | )
State and political subdivision debt securities | 1,948 |  |  | (36 | ) |  | 2,084 |  |  | (81 | ) |  | 4,032 |  |  | (117 | )
Corporate debt securities | 1,424 |  |  | (23 | ) |  | — |  |  | — |  |  | 1,424 |  |  | (23 | )
Marketable equity securities | 1,393 |  |  | (90 | ) |  | 157 |  |  | (40 | ) |  | 1,550 |  |  | (130 | )
| $ | 8,563 |  |  | $ | (188 | ) |  | $ | 4,203 |  |  | $ | (173 | ) |  | $ | 12,766 |  |  | $ | (361 | )
Based on the Company's ability and intent to hold the investments for a reasonable period of time sufficient for a forecasted recovery of fair value, the Company does not consider any investments to be other-than-temporarily impaired at March 31, 2018. The amortized cost and fair value of the Company's investments in debt securities, by contractual maturity, are shown in the table below (in thousands). Expected maturities differ from contractual maturities as borrowers may have the right to call or prepay obligations with or without call or prepayment penalties.
| March 31, 2018
| Amortized Cost |  | Fair Value
Due in less than one year | $ | 1,005 |  |  | $ | 990 |
Due after one year through five years | 3,140 |  |  | 3,056 |
Due after five years through ten years | 1,228 |  |  | 1,197 |
Due after ten years | 3,385 |  |  | 3,439 |
Mortgage-backed securities | 7,654 |  |  | 7,499 |
| $ | 16,412 |  |  | $ | 16,181 |
We recognize investment gains and losses when we sell or otherwise dispose of securities on a specific identification method. Gross gains realized on the sales of investment securities for fiscal years 2018, 2017 and 2016 were approximately $6.0 million, $1.1 million and $431,000, respectively. Gross losses realized were approximately $266,000, $413,000 and $385,000 for fiscal years 2018, 2017 and 2016, respectively.

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