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Investments and Fair Value Measurements (Unrealized Loss Position) (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 28, 2018
Sep. 29, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash $ 918,064 $ 627,017
Long-term investments, unrealized gains 0  
Short-term investments, cost 380,795 561,977
Available-for-sale Debt Securities, Gross Unrealized Loss $ 1  
Document Period End Date Sep. 28, 2018  
Short term investments, total $ 377,723 561,366
Fair Value 206,479 211,423
Gross Unrealized Losses (2,204) (437)
Greater than 12 months, Fair Value 80,613 129,546
Greater than 12 months, Gross Unrealized Losses (967) (616)
Investment Owned, at Cost 1,286,810 1,189,392
Investment Owned, Unrecognized Unrealized Appreciation (343) (799)
Long-term investments    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term investments, unrealized gains   718
Available-for-sale Securities, Gross Unrealized Loss   853
Certificates of Deposit    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available-for-sale Debt Securities, Gross Unrealized Loss   1
Short term investments, total   17,244
Fair Value 0 19,750
Gross Unrealized Losses 0 (6)
Greater than 12 months, Fair Value 0 0
Greater than 12 months, Gross Unrealized Losses 0 0
U.S. agency securities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair Value 0 19,713
Gross Unrealized Losses 0 (91)
Greater than 12 months, Fair Value 21,486 11,386
Greater than 12 months, Gross Unrealized Losses (302) (108)
Corporate bonds    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Short-term investments, cost   174,750
Available-for-sale Debt Securities, Gross Unrealized Loss   163
Short term investments, total   174,641
Fair Value 143,051 125,890
Gross Unrealized Losses (1,680) (251)
Greater than 12 months, Fair Value 52,162 109,806
Greater than 12 months, Gross Unrealized Losses (624) (449)
Municipal debt securities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash 544  
Short-term investments, cost   29,178
Available-for-sale Debt Securities, Gross Unrealized Loss   9
Short term investments, total   29,185
Gross Unrealized Losses (191) (24)
Greater than 12 months, Fair Value 6,965 3,625
Greater than 12 months, Gross Unrealized Losses (41) (10)
Investment Owned, at Cost 41,058 26,749
Government bonds    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term investments, unrealized gains 0  
Short-term investments, cost 2,495 2,034
Available-for-sale Debt Securities, Gross Unrealized Loss   6
Available-for-sale Securities, Gross Unrealized Loss  
Short term investments, total 2,495 2,028
Fair Value 16,633 15,029
Gross Unrealized Losses (332) (64)
Greater than 12 months, Fair Value 0 4,729
Greater than 12 months, Gross Unrealized Losses 0 (49)
Commercial paper    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash 5,058 1,223
Short-term investments, cost   15,160
Available-for-sale Debt Securities, Gross Unrealized Loss   1
Available-for-sale Securities, Gross Unrealized Loss 0  
Short term investments, total   15,161
Greater than 12 months, Fair Value 0 0
Greater than 12 months, Gross Unrealized Losses 0 0
Investment Owned, at Cost 5,737 4,292
Investment Owned, Unrecognized Unrealized Appreciation (1) (1)
Corporate bonds    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash 1,005  
Available-for-sale Debt Securities, Gross Unrealized Loss 0  
Short-term investments | Certificates of Deposit    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Short-term investments, cost 12,875 17,236
Available-for-sale Debt Securities, Gross Unrealized Loss  
Short term investments, total 12,889  
Short-term investments | U.S. agency securities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Short-term investments, cost   9,518
Short-term investments | Corporate bonds    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Short-term investments, cost 111,245  
Available-for-sale Debt Securities, Gross Unrealized Loss 494  
Short term investments, total 110,801  
Short-term investments | Municipal debt securities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Short-term investments, cost 30,475  
Available-for-sale Debt Securities, Gross Unrealized Loss 120  
Short term investments, total 30,355  
Short-term investments | Government bonds    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Short-term investments, cost 7,970  
Available-for-sale Debt Securities, Gross Unrealized Loss 15  
Short term investments, total 7,955  
Short-term investments | Commercial paper    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Short-term investments, cost 4,276  
Available-for-sale Debt Securities, Gross Unrealized Loss 0  
Short term investments, total 4,276  
Long-term investments | Long-term investments    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term investments, unrealized gains 279  
Available-for-sale Securities, Gross Unrealized Loss 2,405  
Long-term investments | Certificates of Deposit    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term investments, unrealized gains   5
Available-for-sale Securities, Gross Unrealized Loss   6
Long-term investments | U.S. agency securities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term investments, unrealized gains 0
Available-for-sale Securities, Gross Unrealized Loss 166 178
Long-term investments | Corporate bonds    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term investments, unrealized gains 33 327
Available-for-sale Securities, Gross Unrealized Loss 1,810 537
Long-term investments | Municipal debt securities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term investments, unrealized gains 29
Available-for-sale Securities, Gross Unrealized Loss 112 25
Long-term investments | Government bonds    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term investments, unrealized gains 0
Available-for-sale Securities, Gross Unrealized Loss $ 317 $ 107