Stockholders' Equity (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 29, 2018	Sep. 30, 2017	Sep. 29, 2018	Sep. 30, 2017
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance, common stock, shares			9,044,858
Ending balance, common stock, shares	9,097,359		9,097,359
Beginning balance			$ 457,106
Net income	$ 15,576	$ 6,182	35,267	$ 17,935
Adjustments to Additional Paid in Capital, Share-based Compensation and Exercise of Stock Options			(173)
Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition			2,115
Other Comprehensive Income (Loss)			(21)
Ending balance	$ 494,748		$ 494,748
Common Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance, common stock, shares			9,044,858
Stock option exercises, shares			52,501
Ending balance, common stock, shares	9,097,359		9,097,359
Beginning balance			$ 90
Net income			0
Adjustments to Additional Paid in Capital, Share-based Compensation and Exercise of Stock Options			1
Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition			0
Other Comprehensive Income (Loss)			0
Ending balance	$ 91		91
Additional paid-in capital
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance			246,197
Net income			0
Adjustments to Additional Paid in Capital, Share-based Compensation and Exercise of Stock Options			(174)
Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition			2,115
Other Comprehensive Income (Loss)			0
Ending balance	248,138		248,138
Retained earnings
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance			209,381
Net income			35,267
Adjustments to Additional Paid in Capital, Share-based Compensation and Exercise of Stock Options			0
Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition			0
Other Comprehensive Income (Loss)			0
Ending balance	246,723		246,723
Accumulated other comprehensive income
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance			1,438
Net income			0
Adjustments to Additional Paid in Capital, Share-based Compensation and Exercise of Stock Options			0
Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition			0
Other Comprehensive Income (Loss)			(21)
Ending balance	(204)		(204)
Accounting Standards Update 2016-01 [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets	1,621		1,621
Accounting Standards Update 2016-01 [Member] | Reclassification out of Accumulated Other Comprehensive Income [Domain]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets	(1,621)		(1,621)
Difference between Revenue Guidance in Effect before and after Topic 606 [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets	$ 454		$ 454