Senior Notes and Other Long-Term Debt - Components of Long-Term Debt (Parenthetical) (Detail) - Ex-Im Credit Facility [Member] $ in Thousands	9 Months Ended
Dec. 31, 2015 USD ($)
Senior Notes
Exposure fees on Ex-Im credit facility expected to be financed under Ex-Im credit facility	$ 13,658
Unamortized discount on Ex-Im Credit Facility related to exposure fees expected to be financed	$ 12,500

Unamortized discount related to exposure fees that are expected to be financed.

No definition available.

Name:	vsat_UnamortizedFinancedDebtDiscount
Namespace Prefix:	vsat_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant