Consolidated Statements of Stockholders' Equity and Redeemable Noncontrolling Interest Statement (USD $) In Thousands, except Share data, unless otherwise specified	Total	Common Stock	Additional paid-in capital	Retained earnings	Accumulated other comprehensive income
Redeemable noncontrolling interest, beginning balance at Mar. 31, 2012	$ 86,541
Beginning balance at Mar. 31, 2012	168,343	69	131,589	36,627	58
Beginning balance, common stock, shares at Mar. 31, 2012		6,890,796
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	4,963	0	0		0
Unrealized gain on available-for-sale securities	119	0	0	0	119
Stock Issued During Period, Shares, New Issues		77,158
Stock option exercises and associated tax benefits, amount	2,199	1	2,198	0	0
Stock-based compensation	1,266	0	1,266	0	0
Increase (Decrease) in Redeemable Noncontrolling Interest [Roll Forward]
Net income	5,334
Other comprehensive income	119
Redeemable noncontrolling interest, ending balance at Mar. 30, 2013	91,994
Ending balance at Mar. 30, 2013	176,890	70	135,053	41,590	177
Ending balance, common stock, shares at Mar. 30, 2013		6,967,954
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	16,238	0	0		0
Unrealized gain on available-for-sale securities	158	0	0	0	158
Stock Issued During Period, Shares, New Issues		9,500
Stock option exercises and associated tax benefits, amount	408	0	408	0	0
Stock-based compensation	2,353	0	2,353	0	0
Increase (Decrease) in Redeemable Noncontrolling Interest [Roll Forward]
Net income	2,468
Other comprehensive income	(76)
MinorityInterestDecreaseFromRedemptionsShares		1,867,370
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests	(94,386)	18	(94,267)	0	101
Redeemable noncontrolling interest, ending balance at Mar. 29, 2014	0
Ending balance at Mar. 29, 2014	290,433	88	232,081	57,828	436
Ending balance, common stock, shares at Mar. 29, 2014	8,844,824	8,844,824
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
Increase (Decrease) in Redeemable Noncontrolling Interest [Roll Forward]
Net income	0
Other comprehensive income	0
Redeemable noncontrolling interest, ending balance at Mar. 28, 2015	0
Ending balance at Mar. 28, 2015	$ 320,154	$ 89	$ 237,916	$ 81,645	$ 504
Ending balance, common stock, shares at Mar. 28, 2015	8,859,199	8,859,199