Income Tax Expense (Benefit) Reconciliation of the U.S. Federal statutory rate (Details)	6 Months Ended	12 Months Ended
	Dec. 21, 2017	Jun. 29, 2018	Jun. 30, 2017	Jul. 01, 2016
Income Tax Disclosure [Abstract]
U.S. Federal statutory rate	35.00%	28.00%	35.00%	35.00%
Tax rate differential on international income		(34.00%)	(27.00%)	(103.00%)
Tax effect of U.S. non-deductible convertible debt costs		0.00%	0.00%	13.00%
Tax effect of U.S. non-deductible acquisition costs		0.00%	0.00%	10.00%
Tax effect of U.S. foreign income inclusion		1.00%	4.00%	9.00%
Tax effect of U.S. non-deductible stock-based compensation		1.00%	1.00%	9.00%
Tax effect of U.S. permanent differences		(1.00%)	(1.00%)	1.00%
State income tax, net of federal tax		0.00%	1.00%	(1.00%)
One-time mandatory deemed repatriation tax		75.00%	0.00%	0.00%
Re-measurement of deferred taxes		(3.00%)	0.00%	0.00%
Change in valuation allowance		5.00%	29.00%	16.00%
Unremitted earnings of certain non-U.S. entities		0.00%	5.00%	0.00%
Tax related to SanDisk integration		0.00%	12.00%	0.00%
Retroactive extension of Federal R&D credit		(0.00%)	(0.00%)	(9.00%)
Income tax credits		(4.00%)	(12.00%)	(43.00%)
Other		0.00%	1.00%	5.00%
Effective tax rate		68.00%	48.00%	(58.00%)