Stockholders' Equity (Details) - USD ($) $ in Thousands	3 Months Ended
	Jun. 29, 2019	Jun. 30, 2018
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance, common stock, shares	9,098,320
Ending balance, common stock, shares	9,111,624
Beginning balance	$ 529,588	$ 457,106
Net income	21,282	19,691
Stock option exercises	(1,252)	(2,168)
Stock-based compensation	630	599
Other comprehensive income, net	89	5
Ending balance	$ 550,337	$ 475,687
Common Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance, common stock, shares	9,098,320	9,044,858
Stock option exercises, shares	13,304	16,448
Ending balance, common stock, shares	9,111,624	9,061,306
Beginning balance	$ 91	$ 90
Net income	0	0
Stock option exercises	0	1
Stock-based compensation	0	0
Other comprehensive income, net	0	0
Ending balance	91	91
Additional paid-in capital
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	249,447	246,197
Net income	0	0
Stock option exercises	(1,252)	(2,169)
Stock-based compensation	630	599
Other comprehensive income, net	0	0
Ending balance	248,825	244,627
Retained earnings
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	280,078	209,381
Net income	21,282	19,691
Stock option exercises	0	0
Stock-based compensation	0	0
Other comprehensive income, net	0	0
Ending balance	301,360	231,147
Accumulated other comprehensive income (loss)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(28)	1,438
Net income	0	0
Stock option exercises	0	0
Stock-based compensation	0	0
Other comprehensive income, net	89	5
Ending balance	$ 61	(178)
ASU 2016-01, net
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets		0
ASU 2016-01, net | Common Stock
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets		0
ASU 2016-01, net | Additional paid-in capital
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets		0
ASU 2016-01, net | Retained earnings
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets		1,621
ASU 2016-01, net | Accumulated other comprehensive income (loss)
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets		(1,621)
ASC 606, net
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets		454
ASC 606, net | Common Stock
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets		0
ASC 606, net | Additional paid-in capital
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets		0
ASC 606, net | Retained earnings
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets		454
ASC 606, net | Accumulated other comprehensive income (loss)
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets		$ 0