Senior Notes and Other Long-Term Debt - Components of Long-Term Debt (Parenthetical) (Detail) - Ex-Im Credit Facility [Member] $ in Thousands	12 Months Ended
Mar. 31, 2016 USD ($)
Senior Notes
Exposure fees from undrawn commitment on Ex-Im Credit Facility expected to be financed through Ex-Im Credit Facility	$ 20,992
Unamortized discount on Ex-Im Credit Facility related to exposure fees expected to be financed	$ 18,700

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