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Employees' Savings Plan (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2012
Compensation and Retirement Disclosure [Abstract]      
Percentage of voluntarily contribution by employees (percent) 80.00%vprt_DefinedContributionPlanMaximumContributionByEmployee    
Percentage of participants voluntary contributions (percent) 50.00%vprt_DefinedContributionPlanMatchingContributionsByEmployer    
Percentage of maximum company contribution (percent) 3.00%vprt_DefinedContributionPlanContributionsByEmployerMaximum    
Requisite service period 4    
Company expensed for plan $ 8,178us-gaap_DefinedContributionPlanCostRecognized $ 7,158us-gaap_DefinedContributionPlanCostRecognized $ 5,301us-gaap_DefinedContributionPlanCostRecognized
Defined Benefit Plan, Benefit Obligation 3,338us-gaap_DefinedBenefitPlanBenefitObligation    
Defined Benefit Plan, Assets for Plan Benefits 11,602us-gaap_DefinedBenefitPlanAssetsForPlanBenefitsCurrentAndNoncurrent    
Pension Expense $ 1,921us-gaap_PensionExpense $ 1,417us-gaap_PensionExpense $ 1,030us-gaap_PensionExpense