Stockholders' Equity (Details) (USD $)	0 Months Ended	3 Months Ended
	Jul. 22, 2013	Jun. 28, 2014		Jun. 29, 2013
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance, common stock, shares		8,844,824
Beginning balance		$ 290,433,000
Stock option exercises, shares	1,867,370
Stock option exercises, amount		241,000
Stock-based compensation		282,000
Net income		5,759,000		1,826,000
Other comprehensive loss		168,000
Ending balance, common stock, shares		8,849,824
Ending balance		296,883,000
Pre-tax unrealized loss on available-for-sale investments		259,000
Common Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance, common stock, shares		8,844,824
Beginning balance		88,000
Stock option exercises, shares		5,000
Stock option exercises, amount		0
Stock-based compensation		0
Net income		0
Other comprehensive loss		0
Ending balance, common stock, shares		8,849,824
Ending balance		88,000
Additional paid-in capital
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance		232,081,000
Stock option exercises, amount		241,000
Stock-based compensation		282,000
Net income		0
Other comprehensive loss		0
Ending balance		232,604,000
Retained earnings
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance		57,828,000
Stock option exercises, amount		0
Stock-based compensation		0
Net income		5,759,000
Other comprehensive loss		0
Ending balance		63,587,000
Accumulated other comprehensive income
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance		436,000
Stock option exercises, amount		0
Stock-based compensation		0
Net income		0
Other comprehensive loss		168,000	[1]
Ending balance		$ 604,000

[1] Other comprehensive income is comprised of unrealized gains and losses on available-for-sale investments. Unrealized gains before tax on available-for-sale investments were $259,000 for the three months ended June 28, 2014.