Basis of Presentation - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended
	Dec. 28, 2012	Dec. 30, 2011	Dec. 28, 2012 Y	Dec. 30, 2011	Mar. 30, 2012
Company And Summary Of Significant Accounting Policies [Line Items]
Forward loss related to loss contracts	$ 600,000	$ 500,000	$ 3,100,000	$ 1,200,000
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 completed for fiscal year 2004 and subsequent fiscal years. Although the Company has recorded contract revenues subsequent to fiscal year 2003 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.
Total US government contract-related reserves balance	6,900,000		6,900,000		6,700,000
Advertising Expense	5,500,000	100,000	17,000,000	1,600,000
Interest Costs Capitalized	700,000	8,100,000	2,300,000	23,400,000
CPE leased equipment, total cost	140,900,000		140,900,000		85,300,000
Less accumulated depreciation and amortization	262,790,000		262,790,000		209,044,000
Capital Leases	3,100,000		3,100,000		3,100,000
Capital lease accumulated amortization	1,200,000		1,200,000		800,000
Total capitalized cost related to patents	3,200,000		3,200,000		3,200,000
Total capitalized costs related to orbital slots and other licenses	8,600,000		8,600,000		8,400,000
Accumulated amortization of patents and other licenses	600,000		600,000		400,000
Amortization expense related to patents and other licenses	0	0	0	0
Impairment of long-lived assets (property, equipment, and satellites, and other assets) recorded	0	0	0	0
Payment of debt issuance costs	5,800,000	0	8,059,000	0
Capitalized costs, net, related to software developed for resale	55,649,000		55,649,000		41,992,000
Life over which software development costs are amortized once product is available for general release			5
Capitalized cost related to software development for resale	6,600,000	6,500,000	19,100,000	15,800,000
Amortization expense of software development costs	1,700,000	800,000	5,500,000	3,200,000
Self-insurance liability	2,000,000		2,000,000		1,700,000
Accrued indemnification losses	0		0		0
Purchase of treasury shares pursuant to vesting of certain RSU agreements			7,902,000
Notional value of foreign currency forward contracts outstanding	2,500,000		2,500,000		9,600,000
Estimated net amount of unrealized gains or losses on foreign currency cash flow income expected to be reclassified to earnings within the next twelve months	100,000		100,000
Gains or losses from ineffectiveness of derivative instruments	0	0	0	0
Foreign currency forward contracts maturity			Nine to twenty three months
Stock-based compensation expense	7,000,000	5,800,000	19,410,000	14,778,000
Incremental tax benefit from stock options exercised and restricted stock unit awards vesting			0	0
Common Stock [Member]
Company And Summary Of Significant Accounting Policies [Line Items]
Common stock issued based on the vesting terms of certain restricted stock unit agreements			576,061	443,607
Common Stock Held in Treasury [Member]
Company And Summary Of Significant Accounting Policies [Line Items]
Purchase of treasury shares pursuant to vesting of certain RSU agreements, shares			209,135	157,183
Purchase of treasury shares pursuant to vesting of certain RSU agreements			7,902,000	7,000,000
Repurchased shares of common stock held in treasury	936,809		936,809		727,674
Accounting Standards Update 2012-02 [Member]
Company And Summary Of Significant Accounting Policies [Line Items]
Description of new accounting pronouncements			In July 2012, the FASB issued ASU 2012-02, Intangibles—Goodwill and Other (ASC 350): Testing Indefinite-Lived Intangible Assets for Impairment. The new authoritative guidance simplifies the requirements for testing for indefinite-lived intangible assets other than goodwill and permits an entity to first assess qualitative factors to determine whether it is necessary to perform a quantitative fair value test. The guidance is effective for the Company for annual and, if any, interim impairment tests in the fiscal year ending April 4, 2014 with early adoption permitted. The Company anticipates that the adoption of this standard will not have a material impact on the Company or its condensed consolidated financial statements.
Accounting Standards Update No 2011-05 [Member]
Company And Summary Of Significant Accounting Policies [Line Items]
Description of new accounting pronouncements			In June 2011, the FASB issued ASU 2011-05, Comprehensive Income (ASC 220): Presentation of Comprehensive Income. The new authoritative guidance requires an entity to present the total of comprehensive income, the components of net income, and the components of other comprehensive income either in a single continuous statement of comprehensive income or in two separate but consecutive statements. The new authoritative guidance eliminates the option to present the components of other comprehensive income as part of the statement of equity. In December 2011, the FASB further amended its guidance to defer changes related to the presentation of reclassification adjustments indefinitely as a result of concerns raised by stakeholders that the new presentation requirements would be difficult for preparers and add unnecessary complexity to financial statements. The authoritative guidance (other than the portion regarding the presentation of reclassification adjustments which, as noted above, has been deferred indefinitely) became effective for the Company beginning in the first quarter of fiscal year 2013. In the first quarter of fiscal year 2013, the Company retrospectively adopted the new accounting standard for the presentation of comprehensive income in financial statements which resulted in the presentation of a total for comprehensive income (loss), and the components of net income (loss) and other comprehensive income (loss) in one statement. The adoption of this standard only changed how the Company presents comprehensive income (loss) and did not impact the Company’s consolidated financial position, results of operations or cash flows.
Accounting Standards Update No 2011-08 [Member]
Company And Summary Of Significant Accounting Policies [Line Items]
Description of new accounting pronouncements			In September 2011, the FASB issued ASU 2011-08, Intangibles—Goodwill and Other (ASC 350): Testing Goodwill for Impairment. The new authoritative guidance simplifies how an entity tests goodwill for impairment. The new authoritative guidance allows an entity to first assess qualitative factors to determine whether it is necessary to perform the two-step quantitative goodwill impairment test. The two-step quantitative impairment test is required only if, based on its qualitative assessment, an entity determines that it is more likely than not that the fair value of a reporting unit is less than its carrying amount. This authoritative guidance is effective for interim and annual goodwill impairment tests performed for fiscal years beginning after December 15, 2011. Early adoption is permitted if an entity’s financial statements for the more recent interim and annual period have not yet been issued. The Company early adopted this authoritative guidance in the fourth quarter of fiscal year 2012. Adoption of this authoritative guidance did not have a material impact on the Company’s consolidated financial statements and disclosures.
Accounting Standards Update No 2011-11 [Member]
Company And Summary Of Significant Accounting Policies [Line Items]
Description of new accounting pronouncements			In December 2011, the FASB issued ASU 2011-11, Balance Sheet (ASC 210): Disclosures about offsetting Assets and Liabilities. The new authoritative guidance requires an entity to disclose information about offsetting and related arrangements to enable users of its financial statements to evaluate the effect or potential effect of netting arrangements on an entity’s financial position, including the effect or potential effect of rights of setoff associated with certain financial instruments and derivative instruments in the scope of this authoritative guidance. This authoritative guidance will be effective for the Company beginning in the first quarter of fiscal year 2014 and should be applied retrospectively for all comparative periods presented. The Company is currently evaluating the impact that this authoritative guidance may have on its consolidated financial statements and disclosures.
Customer Premise Equipment [Member]
Company And Summary Of Significant Accounting Policies [Line Items]
Less accumulated depreciation and amortization	$ 45,900,000		$ 45,900,000		$ 33,100,000
Minimum [Member]
Company And Summary Of Significant Accounting Policies [Line Items]
Property, equipment and satellites, estimated useful life (years)			2 years
Minimum [Member] | Customer Premise Equipment [Member]
Company And Summary Of Significant Accounting Policies [Line Items]
Property, equipment and satellites, estimated useful life (years)			3 years
Maximum [Member]
Company And Summary Of Significant Accounting Policies [Line Items]
Property, equipment and satellites, estimated useful life (years)			24 years
Maximum [Member] | Customer Premise Equipment [Member]
Company And Summary Of Significant Accounting Policies [Line Items]
Property, equipment and satellites, estimated useful life (years)			5 years