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Business Combination - Additional Information (Detail) (MeVis Medical Solutions AG (MeVis))
In Millions, except Per Share data, unless otherwise specified
0 Months Ended
Apr. 03, 2015
EUR (€)
Apr. 21, 2015
Subsequent Event
USD ($)
Apr. 21, 2015
Subsequent Event
Apr. 03, 2015
Other Assets
USD ($)
Business Acquisition [Line Items]        
Restricted cash to fund the tender offer       $ 34.7us-gaap_RestrictedCashAndCashEquivalents
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherAssetsMember
/ us-gaap_BusinessAcquisitionAxis
= var_MeVisMedicalSolutionsAGMeVisMember
Voluntary tender offer, share price € 17.50var_VoluntaryTenderOfferSharePrice
/ us-gaap_BusinessAcquisitionAxis
= var_MeVisMedicalSolutionsAGMeVisMember
     
Percent of outstanding shares acquired     73.50%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired
/ us-gaap_BusinessAcquisitionAxis
= var_MeVisMedicalSolutionsAGMeVisMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
 
Payments to acquire businesses, gross   $ 25.5us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_BusinessAcquisitionAxis
= var_MeVisMedicalSolutionsAGMeVisMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember