Summary of Investments (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 30, 2014	Jun. 30, 2013
Financial Instruments [Line Items]
Fair Value	$ 1,462,171	$ 1,334,746
Cash
Financial Instruments [Line Items]
Cost	254,982	438,813
Fair Value	254,982	438,813
Fixed Income Money Market Funds
Financial Instruments [Line Items]
Cost	1,042,596	725,311
Fair Value	1,042,596	725,311
Municipal Notes And Bonds
Financial Instruments [Line Items]
Cost	248,050	268,390
Unrealized Gain	927	805
Unrealized (Loss)	(28)	(449)
Fair Value	248,949	268,746
US Treasury and Agencies
Financial Instruments [Line Items]
Cost	183,072	155,648
Unrealized Gain	61	18
Unrealized (Loss)	(166)	(373)
Fair Value	182,967	155,293
Government-Sponsored Enterprises
Financial Instruments [Line Items]
Cost	41,068	54,835
Unrealized Gain	51	65
Unrealized (Loss)	(30)	(95)
Fair Value	41,089	54,805
Foreign Government Bonds
Financial Instruments [Line Items]
Cost	34,979	24,950
Unrealized Gain	95	47
Unrealized (Loss)	(86)	(25)
Fair Value	34,988	24,972
Corporate Notes And Bonds
Financial Instruments [Line Items]
Cost	960,356	861,109
Unrealized Gain	1,771	1,328
Unrealized (Loss)	(749)	(1,945)
Fair Value	961,378	860,492
Mortgage Backed Securities - Residential
Financial Instruments [Line Items]
Cost	26,802	27,618
Unrealized Gain	30	29
Unrealized (Loss)	(252)	(282)
Fair Value	26,580	27,365
Mortgage Backed Securities - Commercial
Financial Instruments [Line Items]
Cost	105,264	108,204
Unrealized Gain	141	426
Unrealized (Loss)	(548)	(672)
Fair Value	104,857	107,958
Total Cash And Short Term Investments
Financial Instruments [Line Items]
Cost	2,897,169	2,664,878
Unrealized Gain	3,076	2,718
Unrealized (Loss)	(1,859)	(3,841)
Fair Value	2,898,386	2,663,755
Publicly Traded Equity Securities
Financial Instruments [Line Items]
Cost		5,610
Unrealized Gain		1,486
Fair Value		7,096
Private Equity Securities
Financial Instruments [Line Items]
Cost		5,000
Fair Value		5,000
Mutual Funds
Financial Instruments [Line Items]
Cost	25,656	16,611
Unrealized Gain	2,903	1,619
Unrealized (Loss)		(14)
Fair Value	28,559	18,216
Total Financial Instruments
Financial Instruments [Line Items]
Cost	2,922,825	2,692,099
Unrealized Gain	5,979	5,823
Unrealized (Loss)	(1,859)	(3,855)
Fair Value	2,926,945	2,694,067
Cash and Cash Equivalents
Financial Instruments [Line Items]
Cost	1,292,301	1,162,473
Fair Value	1,292,301	1,162,473
Short-term Investments
Financial Instruments [Line Items]
Cost	1,460,954	1,335,868
Unrealized Gain	3,076	2,718
Unrealized (Loss)	(1,859)	(3,841)
Fair Value	1,462,171	1,334,745
Restricted Cash And Investments
Financial Instruments [Line Items]
Cost	143,914	166,536
Fair Value	143,914	166,536
Other Assets
Financial Instruments [Line Items]
Cost	25,656	27,222
Unrealized Gain	2,903	3,105
Unrealized (Loss)		(14)
Fair Value	28,559	30,313
Total
Financial Instruments [Line Items]
Cost	2,922,825	2,692,099
Unrealized Gain	5,979	5,823
Unrealized (Loss)	(1,859)	(3,855)
Fair Value	$ 2,926,945	$ 2,694,067