Consolidated Statements of Stockholders' Equity and Redeemable Noncontrolling Interest Statement - USD ($) $ in Thousands	Total	Common Stock	Additional paid-in capital	Retained earnings	Accumulated other comprehensive income
Beginning balance, common stock, shares at Mar. 29, 2014		8,844,824
Beginning balance at Mar. 29, 2014	$ 290,433	$ 88	$ 232,081	$ 57,828	$ 436
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	23,817	0	0		0
Unrealized gain on available-for-sale securities	68	$ 0	0	0	68
Stock Issued During Period, Shares, New Issues		14,375
Stock option exercises and associated tax benefits, amount	4,179	$ 1	4,178	0	0
Stock-based compensation	1,657	$ 0	1,657	0	0
Ending balance, common stock, shares at Mar. 28, 2015		8,859,199
Ending balance at Mar. 28, 2015	320,154	$ 89	237,916	81,645	504
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	28,541	0	0		0
Unrealized gain on available-for-sale securities	785	$ 0	0	0	785
Stock Issued During Period, Shares, New Issues		68,790
Stock option exercises and associated tax benefits, amount	1,984	$ 0	1,984
Stock-based compensation	$ 1,762		1,762
Ending balance, common stock, shares at Apr. 02, 2016	8,927,989	8,927,989
Ending balance at Apr. 02, 2016	$ 353,226	$ 89	241,662	110,186	1,289
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	37,955	0	0		0
Unrealized gain on available-for-sale securities	97	$ 0	0	0	97
Stock Issued During Period, Shares, New Issues		66,979
Stock option exercises and associated tax benefits, amount	1,005	$ 1	1,004	0	0
Stock-based compensation	$ 2,125	$ 0	2,125	0	0
Ending balance, common stock, shares at Apr. 01, 2017	8,994,968	8,994,968
Ending balance at Apr. 01, 2017	$ 394,408	$ 90	$ 244,791	$ 148,141	$ 1,386