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Stockholders' Equity (Details) - USD ($) | 3 Months Ended
--- | ---
Jul. 01, 2017 | Jul. 02, 2016
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets |  | $ 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 |  | (1,780,000) |
Stock-based compensation |  | 513,000 |
Net income |  | 11,753,000 | $ 5,443,000
Other comprehensive loss | [1] | $ (555,000) |
Ending balance, common stock, shares |  | 9,018,820 |
Ending balance |  | $ 404,408,000 |
Pre-tax unrealized loss on available-for-sale investments |  | $ (909,000) |
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 |  | 23,852 |
Stock option exercises, amount |  | $ 0 |
Stock-based compensation |  | 0 |
Net income |  | 0 |
Other comprehensive loss |  | $ 0 |
Ending balance, common stock, shares |  | 9,018,820 |
Ending balance |  | $ 90,000 |
Additional paid-in capital |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Beginning balance |  | 244,791,000 |
Stock option exercises, amount |  | (1,780,000) |
Stock-based compensation |  | 513,000 |
Net income |  | 0 |
Other comprehensive loss |  | 0 |
Ending balance |  | 243,524,000 |
Retained earnings |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Beginning balance |  | 148,141,000 |
Stock option exercises, amount |  |  |
Stock-based compensation |  | 0 |
Net income |  | 11,753,000 |
Other comprehensive loss |  | 0 |
Ending balance |  | 159,963,000 |
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] | (555,000) |
Ending balance |  | $ 831,000 |
[1] | Other comprehensive income is comprised of unrealized gains and losses on available-for-sale investments. Unrealized losses before tax effect on available-for-sale securities were $909,000 for the three months ended July 1, 2017.

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- Definition Changes in additional paid in capital related to exercise of share-based payments awards (such as stock options) and the amount of recognized equity-based compensation during the period (such as nonvested shares). + References No definition available. + Details
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