Stockholders' Equity (Details) (USD $)	0 Months Ended	3 Months Ended		6 Months Ended
	Jul. 22, 2013	Sep. 27, 2014	Sep. 28, 2013	Sep. 27, 2014		Sep. 28, 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				3,357,000
Stock-based compensation				1,114,000
Net income		5,467,000	4,310,000	11,226,000		6,136,000
Other comprehensive loss				66,000	[1]
Ending balance, common stock, shares		8,857,449		8,857,449
Ending balance		306,196,000		306,196,000
Pre-tax unrealized loss on available-for-sale investments				106,000
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				12,625
Stock option exercises, amount				1,000
Stock-based compensation				0
Net income				0
Other comprehensive loss				0
Ending balance, common stock, shares		8,857,449		8,857,449
Ending balance		89,000		89,000
Additional paid-in capital
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance				232,081,000
Stock option exercises, amount				3,356,000
Stock-based compensation				1,114,000
Net income				0
Other comprehensive loss				0
Ending balance		236,551,000		236,551,000
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				11,226,000
Other comprehensive loss				0
Ending balance		69,054,000		69,054,000
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				66,000	[1]
Ending balance		$ 502,000		$ 502,000

[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 $106,000 for the six months ended September 27, 2014.