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Balance Sheet Components - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
Apr. 03, 2015
Sep. 26, 2014
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale corporate debt securities $ 80.0us-gaap_AvailableForSaleSecurities $ 75.6us-gaap_AvailableForSaleSecurities
Tranche A loan | Short-term Investments    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale corporate debt securities 70.1us-gaap_AvailableForSaleSecurities
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_ShortTermInvestmentsMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= var_TrancheALoansMember		 66.2us-gaap_AvailableForSaleSecurities
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_ShortTermInvestmentsMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= var_TrancheALoansMember
Tranche B loan | Other Assets    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale corporate debt securities $ 9.9us-gaap_AvailableForSaleSecurities
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherAssetsMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= var_TrancheBLoansMember		 $ 9.4us-gaap_AvailableForSaleSecurities
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherAssetsMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= var_TrancheBLoansMember