FINANCIAL INSTRUMENTS - Cash, Cash Equivalents, Investments, Restricted Cash and Investments and Other Assets Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands	Dec. 29, 2019	Jun. 30, 2019		Dec. 23, 2018
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt securities, cost	$ 4,356,983
Total cost	5,012,545	$ 5,760,736
Total, unrealized gain	6,694	3,836
Total unrealized (loss)	(994)	(451)
Total fair value	5,018,245	5,764,121
Cash and Cash Equivalents	3,035,887	3,658,219	[1]	$ 3,359,793
Investments	1,647,867	1,772,984	[1]
Restricted cash and investments	253,907	255,177	[1]
Other Assets	80,584	77,741
Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total cost	1,528,924	2,187,275
Total, unrealized gain	5,908	1,346
Total unrealized (loss)	(506)	(307)
Total fair value	1,534,326	2,188,314
Cash and Cash Equivalents	977,274	1,731,640
Investments	476,468	378,933
Restricted cash and investments	0	0
Other Assets	80,584	77,741
Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total cost	1,296,775	1,542,315
Total, unrealized gain	786	2,490
Total unrealized (loss)	(488)	(144)
Total fair value	1,297,073	1,544,661
Cash and Cash Equivalents	125,674	150,610
Investments	1,171,399	1,394,051
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	580,318	467,460
Cash and Cash Equivalents	576,439	462,310
Investments	0	0
Restricted cash and investments	3,879	5,150
Other Assets	0	0
Time deposit
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and Cash Equivalents	1,606,528	1,563,686
Cash and Cash Equivalents	1,356,500	1,313,659
Investments	0	0
Restricted cash and investments	250,028	250,027
Other Assets	0	0
Money market funds | Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt securities, cost	977,274	1,644,659
Debt securities, unrealized gain	0	0
Debt securities, unrealized (loss)	0	0
Debt securities, fair value	977,274	1,644,659
Cash and Cash Equivalents	977,274	1,644,659
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	476,406	465,655
Debt securities, unrealized gain	116	283
Debt securities, unrealized (loss)	(54)	(24)
Debt securities, fair value	476,468	465,914
Cash and Cash Equivalents	0	86,981
Investments	476,468	378,933
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	75,244	76,961
Trading securities, unrealized gain	5,792	1,063
Trading securities, unrealized (loss)	(452)	(283)
Trading securities, fair value	80,584	77,741
Cash and Cash Equivalents	0	0
Investments	0	0
Restricted cash and investments	0	0
Other Assets	80,584	77,741
Government-sponsored enterprises | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt securities, cost	9,819	16,005
Debt securities, unrealized gain	0	5
Debt securities, unrealized (loss)	(3)	(41)
Debt securities, fair value	9,816	15,969
Cash and Cash Equivalents	2,799	0
Investments	7,017	15,969
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	30,507	24,408
Debt securities, unrealized gain	2	35
Debt securities, unrealized (loss)	(6)	0
Debt securities, fair value	30,503	24,443
Cash and Cash Equivalents	0	0
Investments	30,503	24,443
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	1,225,526	1,466,167
Debt securities, unrealized gain	742	2,310
Debt securities, unrealized (loss)	(444)	(99)
Debt securities, fair value	1,225,824	1,468,378
Cash and Cash Equivalents	122,875	150,610
Investments	1,102,949	1,317,768
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	4,172	6,148
Debt securities, unrealized gain	8	0
Debt securities, unrealized (loss)	0	(4)
Debt securities, fair value	4,180	6,144
Cash and Cash Equivalents	0	0
Investments	4,180	6,144
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	26,751	29,587
Debt securities, unrealized gain	34	140
Debt securities, unrealized (loss)	(35)	0
Debt securities, fair value	26,750	29,727
Cash and Cash Equivalents	0	0
Investments	26,750	29,727
Restricted cash and investments	0	0
Other Assets	$ 0	$ 0

[1] Derived from audited financial statements