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Employee Stock Plans - Summary of Share-Based Awards Available for Grant (Detail)
In Thousands, unless otherwise specified
 6 Months Ended
Apr. 03, 2015
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant [Roll Forward]  
Shares Available for Grant, Beginning Balance 8,168us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
Shares Available for Grant, Granted (1,790)var_StockOptionAndOtherShareBasedAwardsGranted
Shares Available for Grant, Cancelled or expired 273var_StockOptionAndOtherShareBasedAwardsCancelled
Shares Available for Grant, Ending Balance 6,651us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant