Investments in Marketable Securities (Details 1) (USD $) In Thousands, unless otherwise specified	9 Months Ended	12 Months Ended
	Mar. 28, 2015	Jun. 28, 2014
Gross unrealized losses and fair market values of the Company's investments
Less Than 12 months, Fair Value	$ 15,915	$ 6,161
Less Than 12 Months, Unrealized Losses	125	16
12 Months or Longer, Fair Value	2,824	8,286
12 Months or Longer, Unrealized Losses	8	146
Total, Fair Value	18,739	14,447
Total, Unrealized Losses	133	162
US Treasury securities [Member]
Gross unrealized losses and fair market values of the Company's investments
Less Than 12 months, Fair Value	2,000
Less Than 12 Months, Unrealized Losses
12 Months or Longer, Fair Value
12 Months or Longer, Unrealized Losses
Total, Fair Value	2,000
Total, Unrealized Losses
National government and agency securities [Member]
Gross unrealized losses and fair market values of the Company's investments
Less Than 12 months, Fair Value		282
Less Than 12 Months, Unrealized Losses		1
12 Months or Longer, Fair Value	30	91
12 Months or Longer, Unrealized Losses		1
Total, Fair Value	30	373
Total, Unrealized Losses		2
State and municipal bond obligations [Member]
Gross unrealized losses and fair market values of the Company's investments
Less Than 12 months, Fair Value	1,187
Less Than 12 Months, Unrealized Losses	2
12 Months or Longer, Fair Value		695
12 Months or Longer, Unrealized Losses		4
Total, Fair Value	1,187	695
Total, Unrealized Losses	2	4
Corporate bonds and notes [Member]
Gross unrealized losses and fair market values of the Company's investments
Less Than 12 months, Fair Value	8,857	3,901
Less Than 12 Months, Unrealized Losses	105	11
12 Months or Longer, Fair Value	1,807	5,801
12 Months or Longer, Unrealized Losses	5	132
Total, Fair Value	10,664	9,702
Total, Unrealized Losses	110	143
Asset backed securities [Member]
Gross unrealized losses and fair market values of the Company's investments
Less Than 12 months, Fair Value	2,368	895
Less Than 12 Months, Unrealized Losses	14	1
12 Months or Longer, Fair Value	652	1,195
12 Months or Longer, Unrealized Losses	3	5
Total, Fair Value	3,020	2,090
Total, Unrealized Losses	17	6
Mortgage backed securities [Member]
Gross unrealized losses and fair market values of the Company's investments
Less Than 12 months, Fair Value	1,503	1,083
Less Than 12 Months, Unrealized Losses	4	3
12 Months or Longer, Fair Value	335	504
12 Months or Longer, Unrealized Losses		4
Total, Fair Value	1,838	1,587
Total, Unrealized Losses	$ 4	$ 7