Basis of Presentation - Additional Information (Detail) - USD ($)	3 Months Ended
	Jun. 30, 2015	Jul. 04, 2014	Apr. 03, 2015
Company And Summary Of Significant Accounting Policies [Line Items]
Forward loss related to loss contracts	$ 1,400,000	$ 100,000
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 2013 and subsequent fiscal years. As of June 30, 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 2012 without further audit. Although the Company has recorded contract revenues subsequent to fiscal year 2012 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	$ 3,700,000	2,300,000
Capitalized interest expense	6,100,000	3,100,000
Total capitalized costs related to patents	3,200,000		$ 3,200,000
Total capitalized costs related to orbital slots and other licenses	15,200,000		15,100,000
Accumulated amortization of patents and other licenses	1,500,000		1,400,000
Write off costs due to abandonment or impairment	0	0
Capitalized debt issuance costs	0	$ 0
Property Plant and Equipment - Excluding Satellites [Member]
Company And Summary Of Significant Accounting Policies [Line Items]
Property and equipment	901,463,000		878,550,000
Accumulated depreciation and amortization	486,001,000		460,528,000
CPE leased equipment [Member] | Property Plant and Equipment - Excluding Satellites [Member]
Company And Summary Of Significant Accounting Policies [Line Items]
Property and equipment	252,602,000		250,281,000
Accumulated depreciation and amortization	$ 115,200,000		107,800,000
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 Plant and Equipment - Excluding Satellites [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 Plant and Equipment - Excluding Satellites [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	$ 4,000,000		$ 4,300,000
Engreen [Member]
Company And Summary Of Significant Accounting Policies [Line Items]
Purchase price of the acquisition	5,000,000
Purchase price of the acquisition that has been withheld	$ 1,000,000