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Goodwill and Acquired Intangible Assets - Expected Amortization Expense for Acquired Intangible Assets (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Jan. 02, 2015
Jan. 03, 2014
Jan. 02, 2015
Jan. 03, 2014
Apr. 04, 2014
Goodwill and Intangible Assets Disclosure [Abstract]          
For the nine months ended January 2, 2015 $ 4,651vsat_AmortizationOfAcquiredIntangibleAsset $ 3,652vsat_AmortizationOfAcquiredIntangibleAsset $ 13,338vsat_AmortizationOfAcquiredIntangibleAsset $ 10,949vsat_AmortizationOfAcquiredIntangibleAsset  
Expected for the remainder of fiscal year 2015 4,642us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear   4,642us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear    
Expected for fiscal year 2016 15,019us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo   15,019us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo    
Expected for fiscal year 2017 7,699us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree   7,699us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree    
Expected for fiscal year 2018 6,365us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour   6,365us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour    
Expected for fiscal year 2019 3,869us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive   3,869us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive    
Thereafter 8,935us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive   8,935us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive    
Other acquired intangible assets, net $ 46,529us-gaap_FiniteLivedIntangibleAssetsNet   $ 46,529us-gaap_FiniteLivedIntangibleAssetsNet   $ 35,397us-gaap_FiniteLivedIntangibleAssetsNet