Financial Statements of Parent and Subsidiary Guarantors - Condensed Consolidated Statement of Cash Flows (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Jun. 28, 2013	Jun. 29, 2012
Cash flows from operating activities:
Net cash provided by (used in) operating activities	$ 53,822	$ 791
Cash flows from investing activities:
Purchase of property, equipment and satellites, net	(73,030)	(36,882)
Cash paid for patents, licenses and other assets	(11,776)	(6,327)
Payment related to acquisition of business, net of cash acquired	(2,400)
Long-term intercompany notes and investments
Net cash provided by (used in) investing activities	(87,206)	(43,209)
Cash flows from financing activities:
Proceeds from issuance of common stock under equity plans	8,279	4,635
Payment of debt issuance costs		(2,215)
Purchase of common stock in treasury	(273)	(2,020)
Other	(574)	(560)
Long-term intercompany financing
Net cash provided by (used in) financing activities	7,432	(160)
Effect of exchange rate changes on cash	(104)	(113)
Net increase (decrease) in cash and cash equivalents	(26,056)	(42,691)
Cash and cash equivalents at beginning of period	105,738	172,583
Cash and cash equivalents at end of period	79,682	129,892
Issuing Parent Company [Member]
Cash flows from operating activities:
Net cash provided by (used in) operating activities	15,905	(24,999)
Cash flows from investing activities:
Purchase of property, equipment and satellites, net	(39,062)	(12,721)
Cash paid for patents, licenses and other assets	(11,769)	(6,293)
Payment related to acquisition of business, net of cash acquired	(2,400)
Long-term intercompany notes and investments	(362)	(633)
Net cash provided by (used in) investing activities	(53,593)	(19,647)
Cash flows from financing activities:
Proceeds from issuance of common stock under equity plans	8,279	4,635
Payment of debt issuance costs		(2,215)
Purchase of common stock in treasury	(273)	(2,020)
Other	(288)	(287)
Long-term intercompany financing
Net cash provided by (used in) financing activities	7,718	113
Effect of exchange rate changes on cash
Net increase (decrease) in cash and cash equivalents	(29,970)	(44,533)
Cash and cash equivalents at beginning of period	93,780	162,426
Cash and cash equivalents at end of period	63,810	117,893
Guarantor Subsidiaries [Member]
Cash flows from operating activities:
Net cash provided by (used in) operating activities	35,503	25,674
Cash flows from investing activities:
Purchase of property, equipment and satellites, net	(33,693)	(23,944)
Cash paid for patents, licenses and other assets
Payment related to acquisition of business, net of cash acquired
Long-term intercompany notes and investments
Net cash provided by (used in) investing activities	(33,693)	(23,944)
Cash flows from financing activities:
Proceeds from issuance of common stock under equity plans
Payment of debt issuance costs
Purchase of common stock in treasury
Other	(286)	(273)
Long-term intercompany financing
Net cash provided by (used in) financing activities	(286)	(273)
Effect of exchange rate changes on cash
Net increase (decrease) in cash and cash equivalents	1,524	1,457
Cash and cash equivalents at beginning of period	3,112	439
Cash and cash equivalents at end of period	4,636	1,896
Non-Guarantor Subsidiaries [Member]
Cash flows from operating activities:
Net cash provided by (used in) operating activities	2,414	116
Cash flows from investing activities:
Purchase of property, equipment and satellites, net	(275)	(217)
Cash paid for patents, licenses and other assets	(7)	(34)
Payment related to acquisition of business, net of cash acquired
Long-term intercompany notes and investments
Net cash provided by (used in) investing activities	(282)	(251)
Cash flows from financing activities:
Proceeds from issuance of common stock under equity plans
Payment of debt issuance costs
Purchase of common stock in treasury
Other
Long-term intercompany financing	362	633
Net cash provided by (used in) financing activities	362	633
Effect of exchange rate changes on cash	(104)	(113)
Net increase (decrease) in cash and cash equivalents	2,390	385
Cash and cash equivalents at beginning of period	8,846	9,718
Cash and cash equivalents at end of period	11,236	10,103
Consolidation and Elimination Adjustments [Member]
Cash flows from operating activities:
Net cash provided by (used in) operating activities
Cash flows from investing activities:
Purchase of property, equipment and satellites, net
Cash paid for patents, licenses and other assets
Payment related to acquisition of business, net of cash acquired
Long-term intercompany notes and investments	362	633
Net cash provided by (used in) investing activities	362	633
Cash flows from financing activities:
Proceeds from issuance of common stock under equity plans
Payment of debt issuance costs
Purchase of common stock in treasury
Other
Long-term intercompany financing	(362)	(633)
Net cash provided by (used in) financing activities	(362)	(633)
Effect of exchange rate changes on cash
Net increase (decrease) in cash and cash equivalents
Cash and cash equivalents at beginning of period
Cash and cash equivalents at end of period