FINANCIAL INSTRUMENTS - Cash, Cash Equivalents, Investments, Restricted Cash and Investments and Other Assets Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands	Mar. 29, 2020	Jun. 30, 2019		Mar. 31, 2019
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt securities, cost	$ 4,165,074
Total cost	5,720,494	$ 5,760,736
Total, unrealized gain	5,235	3,836
Total unrealized (loss)	(6,818)	(451)
Total fair value	5,718,911	5,764,121
Cash and Cash Equivalents	3,961,586	3,658,219	[1]	$ 4,931,611
Investments	1,431,550	1,772,984	[1]
Restricted cash and investments	254,155	255,177	[1]
Other Assets	71,620	77,741
Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total cost	1,443,257	2,187,275
Total, unrealized gain	4,349	1,346
Total unrealized (loss)	(491)	(307)
Total fair value	1,447,115	2,188,314
Cash and Cash Equivalents	982,289	1,731,640
Investments	393,206	378,933
Restricted cash and investments	0	0
Other Assets	71,620	77,741
Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total cost	1,055,417	1,542,315
Total, unrealized gain	886	2,490
Total unrealized (loss)	(6,327)	(144)
Total fair value	1,049,976	1,544,661
Cash and Cash Equivalents	11,632	150,610
Investments	1,038,344	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	1,486,663	467,460
Cash and Cash Equivalents	1,482,536	462,310
Investments	0	0
Restricted cash and investments	4,127	5,150
Other Assets	0	0
Time deposit
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and Cash Equivalents	1,735,157	1,563,686
Cash and Cash Equivalents	1,485,129	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	944,788	1,644,659
Debt securities, unrealized gain	0	0
Debt securities, unrealized (loss)	0	0
Debt securities, fair value	944,788	1,644,659
Cash and Cash Equivalents	944,788	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	429,712	465,655
Debt securities, unrealized gain	995	283
Debt securities, unrealized (loss)	0	(24)
Debt securities, fair value	430,707	465,914
Cash and Cash Equivalents	37,501	86,981
Investments	393,206	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	68,757	76,961
Trading securities, unrealized gain	3,354	1,063
Trading securities, unrealized (loss)	(491)	(283)
Trading securities, fair value	71,620	77,741
Cash and Cash Equivalents	0	0
Investments	0	0
Restricted cash and investments	0	0
Other Assets	71,620	77,741
Government-sponsored enterprises | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt securities, cost	2,011	16,005
Debt securities, unrealized gain	1	5
Debt securities, unrealized (loss)	0	(41)
Debt securities, fair value	2,012	15,969
Cash and Cash Equivalents	0	0
Investments	2,012	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	32,230	24,408
Debt securities, unrealized gain	48	35
Debt securities, unrealized (loss)	(47)	0
Debt securities, fair value	32,231	24,443
Cash and Cash Equivalents	0	0
Investments	32,231	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	998,591	1,466,167
Debt securities, unrealized gain	658	2,310
Debt securities, unrealized (loss)	(6,280)	(99)
Debt securities, fair value	992,969	1,468,378
Cash and Cash Equivalents	11,632	150,610
Investments	981,337	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	3,628	6,148
Debt securities, unrealized gain	59	0
Debt securities, unrealized (loss)	0	(4)
Debt securities, fair value	3,687	6,144
Cash and Cash Equivalents	0	0
Investments	3,687	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	18,957	29,587
Debt securities, unrealized gain	120	140
Debt securities, unrealized (loss)	0	0
Debt securities, fair value	19,077	29,727
Cash and Cash Equivalents	0	0
Investments	19,077	29,727
Restricted cash and investments	0	0
Other Assets	$ 0	$ 0

[1] Derived from audited financial statements