FINANCIAL INSTRUMENTS - Schedule of Cash, Cash Equivalents, Investments, Restricted Cash and Investments and Other Assets Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands	Dec. 27, 2020	Jun. 28, 2020		Dec. 29, 2019
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt securities, cost	$ 5,142,838
Total cost	6,363,693	$ 7,027,291
Total, unrealized gain	14,654	10,543
Total unrealized (loss)	(331)	(1,244)
Total fair value	6,378,016	7,036,590
Cash and Cash Equivalents	3,687,165	4,915,172	[1]	$ 3,035,887
Investments	2,355,067	1,795,080	[1]
Restricted cash and investments	252,807	253,911	[1]
Other Assets	82,977	72,427
Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total cost	1,588,748	2,330,222
Total, unrealized gain	10,608	4,944
Total unrealized (loss)	(105)	(937)
Total fair value	1,599,251	2,334,229
Cash and Cash Equivalents	933,869	1,786,342
Investments	582,405	475,460
Restricted cash and investments	0	0
Other Assets	82,977	72,427
Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total cost	1,828,223	1,474,552
Total, unrealized gain	4,046	5,599
Total unrealized (loss)	(226)	(307)
Total fair value	1,832,043	1,479,844
Cash and Cash Equivalents	59,381	160,224
Investments	1,772,662	1,319,620
Restricted cash and investments	0	0
Other Assets	0	0
Cash
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents at fair value	1,148,170	977,862
Cash and Cash Equivalents	1,145,390	973,978
Investments	0	0
Restricted cash and investments	2,780	3,884
Other Assets	0	0
Time deposits
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents at fair value	1,798,552	2,244,655
Cash and Cash Equivalents	1,548,525	1,994,628
Investments	0	0
Restricted cash and investments	250,027	250,027
Other Assets	0	0
Money market funds | Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt securities, cost	913,708	1,709,350
Debt securities, unrealized gain	0	0
Debt securities, unrealized (loss)	0	0
Debt securities, fair value	913,708	1,709,350
Cash and Cash Equivalents	913,708	1,709,350
Investments	0	0
Restricted cash and investments	0	0
Other Assets	0	0
U.S. Treasury and agencies | Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt securities, cost	602,355	552,088
Debt securities, unrealized gain	213	373
Debt securities, unrealized (loss)	(2)	(9)
Debt securities, fair value	602,566	552,452
Cash and Cash Equivalents	20,161	76,992
Investments	582,405	475,460
Restricted cash and investments	0	0
Other Assets	0	0
Mutual funds | Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities, cost	72,685	68,784
Trading securities, unrealized gain	10,395	4,571
Trading securities, unrealized (loss)	(103)	(928)
Trading securities, fair value	82,977	72,427
Cash and Cash Equivalents	0	0
Investments	0	0
Restricted cash and investments	0	0
Other Assets	82,977	72,427
Government-sponsored enterprises | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt securities, cost	3,496	31,442
Debt securities, unrealized gain	15	12
Debt securities, unrealized (loss)	0	0
Debt securities, fair value	3,511	31,454
Cash and Cash Equivalents	0	25,999
Investments	3,511	5,455
Restricted cash and investments	0	0
Other Assets	0	0
Foreign government bonds | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt securities, cost	45,112	10,693
Debt securities, unrealized gain	43	28
Debt securities, unrealized (loss)	(2)	(5)
Debt securities, fair value	45,153	10,716
Cash and Cash Equivalents	0	2,540
Investments	45,153	8,176
Restricted cash and investments	0	0
Other Assets	0	0
Corporate notes and bonds | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt securities, cost	1,765,273	1,405,615
Debt securities, unrealized gain	3,878	5,344
Debt securities, unrealized (loss)	(221)	(302)
Debt securities, fair value	1,768,930	1,410,657
Cash and Cash Equivalents	59,381	131,685
Investments	1,709,549	1,278,972
Restricted cash and investments	0	0
Other Assets	0	0
Mortgage backed securities — residential | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt securities, cost	6,997	3,142
Debt securities, unrealized gain	62	71
Debt securities, unrealized (loss)	(3)	0
Debt securities, fair value	7,056	3,213
Cash and Cash Equivalents	0	0
Investments	7,056	3,213
Restricted cash and investments	0	0
Other Assets	0	0
Mortgage backed securities — commercial | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt securities, cost	7,345	23,660
Debt securities, unrealized gain	48	144
Debt securities, unrealized (loss)	0	0
Debt securities, fair value	7,393	23,804
Cash and Cash Equivalents	0	0
Investments	7,393	23,804
Restricted cash and investments	0	0
Other Assets	$ 0	$ 0

[1] Derived from audited financial statements