Basis of Presentation - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2015	Jan. 02, 2015	Dec. 31, 2015	Jan. 02, 2015	Jun. 30, 2015	Apr. 03, 2015
Company And Summary Of Significant Accounting Policies [Line Items]
Forward loss related to loss contracts	$ 400	$ 300	$ 2,100	$ 400
Defense contract audit agency completed cost audits			Contract costs on U.S. government contracts are subject to audit and review by the Defense Contracting Management Agency (DCMA), the Defense Contract Audit Agency (DCAA), and other U.S. government agencies, as well as negotiations with U.S. government representatives. The Company’s incurred cost audits by the DCAA have not been concluded for fiscal year 2015. As of December 31, 2015, the DCAA had completed its incurred cost audit for fiscal year 2004 and approved the Company’s incurred cost claims for fiscal years 2005 through 2014 without further audit. Although the Company has recorded contract revenues subsequent to fiscal year 2014 based upon an estimate of costs that the Company believes will be approved upon final audit or review, the Company does not know the outcome of any ongoing or future audits or reviews and adjustments, and if future adjustments exceed the Company’s estimates, its profitability would be adversely affected.
Advertising expenses	3,100	5,700	$ 9,700	13,000
Capitalized interest expense	7,700	$ 4,100	20,900	$ 10,800
Total capitalized costs related to patents	3,200		3,200			$ 3,200
Total capitalized costs related to orbital slots and other licenses	15,300		15,300			15,100
Accumulated amortization of patents and other licenses	1,600		1,600			1,400
Property and Equipment, Net [Member]
Company And Summary Of Significant Accounting Policies [Line Items]
Property and equipment	1,013,706		1,013,706			878,550
Accumulated depreciation and amortization	541,218		541,218			460,528
CPE leased equipment [Member] | Property and Equipment, Net [Member]
Company And Summary Of Significant Accounting Policies [Line Items]
Property and equipment	255,955		255,955			250,281
Accumulated depreciation and amortization	129,500		$ 129,500			107,800
Minimum [Member]
Company And Summary Of Significant Accounting Policies [Line Items]
Property, equipment and satellites, estimated useful life (years)			2 years
Minimum [Member] | CPE leased equipment [Member] | Property and Equipment, Net [Member]
Company And Summary Of Significant Accounting Policies [Line Items]
Property, equipment and satellites, estimated useful life (years)			4 years
Maximum [Member]
Company And Summary Of Significant Accounting Policies [Line Items]
Property, equipment and satellites, estimated useful life (years)			24 years
Maximum [Member] | CPE leased equipment [Member] | Property and Equipment, Net [Member]
Company And Summary Of Significant Accounting Policies [Line Items]
Property, equipment and satellites, estimated useful life (years)			5 years
Unfavorable Regulatory Action [Member]
Company And Summary Of Significant Accounting Policies [Line Items]
Total U.S. government contract-related reserves balance	$ 2,900		$ 2,900			$ 4,300
Engreen [Member]
Company And Summary Of Significant Accounting Policies [Line Items]
Purchase price of the acquisition					$ 5,300
Purchase price of the acquisition that has been withheld					$ 1,000