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Investments and Fair Value Measurements (Details 2) - USD ($) $ in Millions	Jul. 02, 2016	Jun. 27, 2015
Gross unrealized losses on available-for-sale securities
Gross unrealized losses, Less than 12 Months	$ (0.1)	$ (0.1)
Gross unrealized losses, Greater than 12 Months	(0.3)	(0.2)
Total gross unrealized losses	(0.4)	(0.3)
Debt securities
Contractual maturities of debt securities classified as available-for-sale securities, Amortized cost
Amortized cost of amounts maturing in less than 1 year	252.6
Amortized cost of amounts maturing in 1-5 years	94.3
Amortized cost of amounts maturing in more than 5 years	1.0
Total amortized cost of debt available-for-sale securities	347.9
Contractual maturities of the debt securities classified as available-for-sale securities, Estimated fair value
Estimated fair value amounts maturing in less than 1 year	252.7
Estimated fair value amounts maturing in 1 -5 years	94.5
Estimated fair value amounts maturing in more than 5 years	0.6
Total estimated fair value of debt available-for-sale securities	347.8
Asset-backed securities
Gross unrealized losses on available-for-sale securities
Gross unrealized losses, Less than 12 Months	0.0	0.0
Gross unrealized losses, Greater than 12 Months	(0.3)	(0.2)
Total gross unrealized losses	(0.3)	(0.2)
Corporate securities
Gross unrealized losses on available-for-sale securities
Gross unrealized losses, Less than 12 Months	(0.1)	(0.1)
Gross unrealized losses, Greater than 12 Months	0.0	0.0
Total gross unrealized losses	$ (0.1)	$ (0.1)

X

- Definition

Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity 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)
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Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or longer.

+ References

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-SubTopic 10
-Section 50
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Amount after adjustments of available-for-sale debt securities at cost, maturing in the second through fifth rolling twelve months following the latest balance sheet. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings less cumulative-effect adjustments, and fair value hedge accounting adjustments. For interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of available-for-sale debt securities at cost, net of adjustments, maturing after the fifth 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.

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Amount of available-for-sale debt securities at fair value maturing after the fifth fiscal year following the latest fiscal year.

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