Marketable Securities (Narrative) (Details) $ in Thousands	3 Months Ended
Jun. 24, 2017 USD ($) security	Mar. 25, 2017 USD ($) security
Schedule of Available-for-sale Securities [Line Items]
Gross Unrealized Losses	$ (94)	$ (55)
Amortized cost on available for sale securities held at gross unrealized loss	$ 82,900	$ 99,900
Number of securities in unrealized loss position greater than one year \| security	0	4
Percentage of gross unrealized loss to position (less than)		1.00%
Minimum
Schedule of Available-for-sale Securities [Line Items]
Maturity period for highly-rated securities	1 year
Maximum
Schedule of Available-for-sale Securities [Line Items]
Maturity period for highly-rated securities	3 years

Available-For-Sale Debt Securities, Maturity Period

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- Definition

Amortized cost of available for sale securities in an unrealized loss position.

+ References

No definition available.

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- Definition

Gross Unrealized Loss To Position Value, Percent

+ References

No definition available.

+ Details

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- Definition

Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt securities classified as available-for-sale.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563

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- Definition

Number of investment positions in available-for-sale investments that have been in a continuous unrealized loss position for greater than or equal to a year for which an other-than-temporary impairment (OTTI) has not been recognized in the income statement.

+ References

No definition available.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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