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Basis Of Presentation And Accounting Policies (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Jan. 03, 2015
M
Sep. 27, 2014
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Liquid investments, maximum maturity period, months 3plxs_LiquidInvestmentsMaximumMaturityPeriodMonths  
Fair value of long-term debt $ 249.4us-gaap_LongTermDebtFairValue $ 247.5us-gaap_LongTermDebtFairValue
Long-term Debt $ 250.0us-gaap_LongTermDebt $ 250.0us-gaap_LongTermDebt