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FAIR VALUE MEASUREMENTS (Fair value of financial assets and liabilities) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 27, 2014
Sep. 27, 2014
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Cash and Cash Equivalents $ 622,590us-gaap_CashAndCashEquivalentsFairValueDisclosure $ 587,981us-gaap_CashAndCashEquivalentsFairValueDisclosure
Investments 10,787us-gaap_InvestmentsFairValueDisclosure 9,105us-gaap_InvestmentsFairValueDisclosure
Total Assets 633,377us-gaap_AssetsFairValueDisclosure 597,086us-gaap_AssetsFairValueDisclosure
Fair Value, Measurements, Recurring [Member]    
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Total Assets 633,377us-gaap_AssetsFairValueDisclosure
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597,086us-gaap_AssetsFairValueDisclosure
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Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]    
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Total Assets 633,377us-gaap_AssetsFairValueDisclosure
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Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member]    
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
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Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member]    
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
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Fair Value, Measurements, Recurring [Member] | Cash [Member]    
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Cash and Cash Equivalents 131,263us-gaap_CashAndCashEquivalentsFairValueDisclosure
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Fair Value, Measurements, Recurring [Member] | Cash [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]    
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Cash and Cash Equivalents 131,263us-gaap_CashAndCashEquivalentsFairValueDisclosure
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Fair Value, Measurements, Recurring [Member] | Cash [Member] | Significant Other Observable Inputs (Level 2) [Member]    
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
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Fair Value, Measurements, Recurring [Member] | Cash [Member] | Significant Unobservable Inputs (Level 3) [Member]    
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
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Fair Value, Measurements, Recurring [Member] | Cash equivalents, Money market funds [Member]    
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Cash and Cash Equivalents 327,742us-gaap_CashAndCashEquivalentsFairValueDisclosure
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Fair Value, Measurements, Recurring [Member] | Cash equivalents, Money market funds [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]    
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Cash and Cash Equivalents 327,742us-gaap_CashAndCashEquivalentsFairValueDisclosure
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Fair Value, Measurements, Recurring [Member] | Cash equivalents, Money market funds [Member] | Significant Other Observable Inputs (Level 2) [Member]    
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
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Fair Value, Measurements, Recurring [Member] | Cash equivalents, Money market funds [Member] | Significant Unobservable Inputs (Level 3) [Member]    
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Cash and Cash Equivalents 0us-gaap_CashAndCashEquivalentsFairValueDisclosure
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Fair Value, Measurements, Recurring [Member] | Cash equivalents, Time deposits [Member]    
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Cash and Cash Equivalents 134,085us-gaap_CashAndCashEquivalentsFairValueDisclosure
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Fair Value, Measurements, Recurring [Member] | Cash equivalents, Time deposits [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]    
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Cash and Cash Equivalents 134,085us-gaap_CashAndCashEquivalentsFairValueDisclosure
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Fair Value, Measurements, Recurring [Member] | Cash equivalents, Time deposits [Member] | Significant Other Observable Inputs (Level 2) [Member]    
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
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Fair Value, Measurements, Recurring [Member] | Cash equivalents, Time deposits [Member] | Significant Unobservable Inputs (Level 3) [Member]    
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Cash and Cash Equivalents 0us-gaap_CashAndCashEquivalentsFairValueDisclosure
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Fair Value, Measurements, Recurring [Member] | Commercial Paper [Member]    
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Cash and Cash Equivalents 29,500us-gaap_CashAndCashEquivalentsFairValueDisclosure
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Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
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Fair Value, Measurements, Recurring [Member] | Commercial Paper [Member] | Significant Other Observable Inputs (Level 2) [Member]    
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
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Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
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Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
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Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
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Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
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Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
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