Fair Value Measurements - Investments (Details) (USD $)	3 Months Ended
Jun. 28, 2014	Mar. 29, 2014
Schedule of Available-for-sale Securities
Available-for-sale Securities, Debt Maturities, Next Twelve Months, Amortized Cost Basis	$ 41,200,000
Available for sale Securities Current
Schedule of Available-for-sale Securities
Cost	41,161,000	40,793,000
Available-for-sale Securities, Gross Unrealized Gain	16,000	13,000
Available-for-sale Securities, Gross Unrealized Loss	0	0
Available-for-sale Securities	41,177,000	40,806,000
Available for sale Securities Current \| Commercial Paper
Schedule of Available-for-sale Securities
Cost	20,344,000	6,700,000
Available-for-sale Securities, Gross Unrealized Gain	0	0
Available-for-sale Securities, Gross Unrealized Loss	0	0
Available-for-sale Securities	20,344,000	6,700,000
Available for sale Securities Current \| Government agencies
Schedule of Available-for-sale Securities
Cost	2,000,000	8,035,000
Available-for-sale Securities, Gross Unrealized Gain	2,000
Available-for-sale Securities, Gross Unrealized Loss	0
Available-for-sale Securities	2,002,000	8,037,000
Available for sale Securities Current \| Corporate Bonds
Schedule of Available-for-sale Securities
Cost	7,314,000	17,321,000
Available-for-sale Securities, Gross Unrealized Gain	2,000	7,000
Available-for-sale Securities, Gross Unrealized Loss	0
Available-for-sale Securities	7,316,000	17,328,000
Available for sale Securities Current \| Municipal Bonds
Schedule of Available-for-sale Securities
Cost	11,503,000	8,737,000
Available-for-sale Securities, Gross Unrealized Gain	12,000	4,000
Available-for-sale Securities, Gross Unrealized Loss	0
Available-for-sale Securities	11,515,000	8,741,000
Available for sale Securities Non Current
Schedule of Available-for-sale Securities
Cost		3,976,000
Available-for-sale Securities, Gross Unrealized Gain		9,000
Available-for-sale Securities, Gross Unrealized Loss		0
Available-for-sale Securities		3,985,000
Available for sale Securities Non Current \| Municipal Bonds
Schedule of Available-for-sale Securities
Cost		3,976,000
Available-for-sale Securities, Gross Unrealized Gain		9,000
Available-for-sale Securities, Gross Unrealized Loss		0
Available-for-sale Securities		$ 3,985,000

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 25

-Paragraph 1

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Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

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-Section 50

-Paragraph 5

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Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

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-Section 45

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This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

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Amount of available-for-sale debt securities at cost, net of adjustments, maturing in the next fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings (less any cumulative-effect adjustments, as defined) and fair value hedge accounting adjustments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

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Amount of unrealized gain before deducting unrealized loss on investments in debt and equity securities classified as available-for-sale securities.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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Amount of unrealized loss before deducting unrealized gain on investments in available-for-sale securities.

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