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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

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- Definition

The minimum period that the individual is required to perform services in order to be fully vested under the deferred compensation arrangement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (a)(1)

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- Definition

This represents the entire assets recognized in the balance sheet that are associated with the defined benefit plans.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.10)

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- Definition

1) For defined benefit pension plans, the benefit obligation is the projected benefit obligation, which is the actuarial present value as of a date of all benefits attributed by the pension benefit formula to employee service rendered prior to that date. 2) For other postretirement defined benefit plans, the benefit obligation is the accumulated postretirement benefit obligation, which is the actuarial present value of benefits attributed to employee service rendered to a particular date.

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-Topic 715

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-Glossary Projected Benefit Obligation

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-Name Accounting Standards Codification

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The amount of the cost recognized during the period for defined contribution plans.

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-SubTopic 70

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The amount of pension benefit costs recognized during the period for (1) defined benefit plans and (2) defined contribution plans. For defined benefit plans, pension expense includes the following components: service cost, interest cost, expected return on plan assets, gain (loss) on plan assets, prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments. For defined contribution plans, the pension expense generally equals the firm's contribution to employees' accounts (if the firm contributes) during the period.

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For a defined contribution postretirement plan, the percentage of eligible compensation which the entity will contribute for employees.

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For a defined contribution postretirement plan, the percentage of eligible compensation matched by the employer.

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For a defined contribution postretirement plan, the maximum percentage of eligible compensation which the employee may contribute to the plan.

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