Income Taxes - Reconciliation of Provision for Income Taxes to Amount Computed by Applying Statutory Federal Income Tax Rate to Income before Income Taxes (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Apr. 03, 2015	Apr. 04, 2014	Mar. 29, 2013
Income Tax Disclosure [Abstract]
Tax provision (benefit) at federal statutory rate	$ 18,808	$ (12,132)	$ (31,737)
State tax provision, net of federal benefit	4,014	(3,555)	(3,202)
Tax credits, net of valuation allowance	(14,055)	(13,217)	(17,136)
Non-deductible compensation	1,966	1,337	1,305
Non-deductible meals and entertainment	759	678	448
Foreign effective tax rate differential, net of valuation allowance	898	536	(363)
Other	1,437	406	631
Total provision (benefit) from income taxes	$ 13,827us-gaap_IncomeTaxExpenseBenefit	$ (25,947)us-gaap_IncomeTaxExpenseBenefit	$ (50,054)us-gaap_IncomeTaxExpenseBenefit

Income Taxes - Reconciliation of Provision for Income Taxes to Amount Computed by Applying Statutory Federal Income Tax Rate to Income before Income Taxes (Detail) (USD $)
In Thousands, unless otherwise specified

12 Months Ended

Apr. 03, 2015

Apr. 04, 2014

Mar. 29, 2013

Income Tax Disclosure [Abstract]

Tax provision (benefit) at federal statutory rate

$ 18,808us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate

$ (12,132)us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate

$ (31,737)us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate

State tax provision, net of federal benefit

4,014us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes

(3,555)us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes

(3,202)us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes

Tax credits, net of valuation allowance

(14,055)us-gaap_IncomeTaxReconciliationTaxCredits

(13,217)us-gaap_IncomeTaxReconciliationTaxCredits

(17,136)us-gaap_IncomeTaxReconciliationTaxCredits

Non-deductible compensation

1,966vsat_IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCostAndOtherCompensationRelatedCost

1,337vsat_IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCostAndOtherCompensationRelatedCost

1,305vsat_IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCostAndOtherCompensationRelatedCost

Non-deductible meals and entertainment

759us-gaap_IncomeTaxReconciliationNondeductibleExpenseMealsAndEntertainment

678us-gaap_IncomeTaxReconciliationNondeductibleExpenseMealsAndEntertainment

448us-gaap_IncomeTaxReconciliationNondeductibleExpenseMealsAndEntertainment

Foreign effective tax rate differential, net of valuation allowance

898us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential

536us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential

(363)us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential

Other

1,437us-gaap_IncomeTaxReconciliationOtherReconcilingItems

406us-gaap_IncomeTaxReconciliationOtherReconcilingItems

631us-gaap_IncomeTaxReconciliationOtherReconcilingItems

Total provision (benefit) from income taxes

$ 13,827us-gaap_IncomeTaxExpenseBenefit

$ (25,947)us-gaap_IncomeTaxExpenseBenefit

$ (50,054)us-gaap_IncomeTaxExpenseBenefit

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.4-08.(h))

-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 08

-Paragraph h

-Article 4

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Income Tax Expense (or Benefit)

-URI http://asc.fasb.org/extlink&oid=6515339

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 9

-Subparagraph (a),(b)

-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 12

-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 13

-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 08

-Paragraph h

-Subparagraph 1

-Article 4

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The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to tax exempt income, equity in earnings (loss) of an unconsolidated subsidiary, minority noncontrolling interest income (loss), tax holiday, disposition of a business, disposition of an asset, repatriation of foreign earnings, repatriation of foreign earnings jobs creation act of 2004, increase (decrease) in enacted tax rate, prior year income taxes, increase (decrease) in deferred tax asset valuation allowance, and other adjustments.

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The portion of the difference between total income tax expense or benefit as reported in the Income Statement for the period and the expected income tax expense or benefit computed by applying the domestic federal statutory income tax rates to pretax income from continuing operations attributable to differences in the deductibility of incentive stock options, other equity-based compensation costs and non-allowable compensation related cost in accordance with generally accepted accounting principles and enacted tax laws.

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