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Stockholders' Equity (Details) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Sep. 30, 2017 | Oct. 01, 2016 | Sep. 30, 2017 | Oct. 01, 2016
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets |  | $ 69,000 |  | $ 69,000 |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Beginning balance, common stock, shares |  |  |  | 8,994,968 |
Beginning balance |  |  |  | $ 394,408,000 |
Stock option exercises, amount |  |  |  | (1,583,000) |
Stock-based compensation |  |  |  | 1,535,000 |
Net income |  | $ 6,182,000 | $ 9,341,000 | 17,935,000 | $ 14,784,000
Other comprehensive loss | [1] |  |  | $ 604,000 |
Ending balance, common stock, shares |  | 9,027,594 |  | 9,027,594 |
Ending balance |  | $ 412,968,000 |  | $ 412,968,000 |
Pre-tax unrealized loss on available-for-sale investments |  |  |  | $ 983,000,000 |
Common Stock |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Beginning balance, common stock, shares |  |  |  | 8,994,968 |
Beginning balance |  |  |  | $ 90,000 |
Stock option exercises, shares |  |  |  | 32,626 |
Stock option exercises, amount |  |  |  | $ 0 |
Stock-based compensation |  |  |  | 0 |
Net income |  |  |  | 0 |
Other comprehensive loss |  |  |  | $ 0 |
Ending balance, common stock, shares |  | 9,027,594 |  | 9,027,594 |
Ending balance |  | $ 90,000 |  | $ 90,000 |
Additional paid-in capital |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Beginning balance |  |  |  | 244,791,000 |
Stock option exercises, amount |  |  |  | (1,583,000) |
Stock-based compensation |  |  |  | 1,535,000 |
Net income |  |  |  | 0 |
Other comprehensive loss |  |  |  | 0 |
Ending balance |  | 244,743,000 |  | 244,743,000 |
Retained earnings |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Beginning balance |  |  |  | 148,141,000 |
Stock option exercises, amount |  |  |  |  |
Stock-based compensation |  |  |  | 0 |
Net income |  |  |  | 17,935,000 |
Other comprehensive loss |  |  |  | 0 |
Ending balance |  | 166,145,000 |  | 166,145,000 |
Accumulated other comprehensive income |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Beginning balance |  |  |  | 1,386,000 |
Stock option exercises, amount |  |  |  | 0 |
Stock-based compensation |  |  |  | 0 |
Net income |  |  |  | 0 |
Other comprehensive loss | [1] |  |  | 604,000 |
Ending balance |  | $ 1,990,000 |  | $ 1,990,000 |
[1] | Other comprehensive income is comprised of unrealized gains and losses on available-for-sale investments. Unrealized gains before tax effect on available-for-sale securities were $983,000 for the six months ended September 30, 2017.

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