Segment Information - Segment Revenues and Operating (Losses) Profits (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
Revenues:
Product revenues	$ 174,299us-gaap_SalesRevenueGoodsNet	$ 193,846us-gaap_SalesRevenueGoodsNet	$ 536,352us-gaap_SalesRevenueGoodsNet	$ 586,398us-gaap_SalesRevenueGoodsNet
Service revenues	165,254us-gaap_SalesRevenueServicesNet	138,709us-gaap_SalesRevenueServicesNet	481,430us-gaap_SalesRevenueServicesNet	421,140us-gaap_SalesRevenueServicesNet
Total revenues	339,553us-gaap_SalesRevenueNet	332,555us-gaap_SalesRevenueNet	1,017,782us-gaap_SalesRevenueNet	1,007,538us-gaap_SalesRevenueNet
Operating profits (losses):
Amortization of acquired intangible assets	(4,651)	(3,652)	(13,338)	(10,949)
Income (loss) from operations	18,178us-gaap_OperatingIncomeLoss	1,524us-gaap_OperatingIncomeLoss	63,465us-gaap_OperatingIncomeLoss	4,438us-gaap_OperatingIncomeLoss
Satellite Services [Member]
Operating profits (losses):
Amortization of acquired intangible assets	(2,765)	(2,765)	(8,295)	(8,295)
Commercial Networks [Member]
Operating profits (losses):
Amortization of acquired intangible assets	(369)	(343)	(1,084)	(994)
Government Systems [Member]
Operating profits (losses):
Amortization of acquired intangible assets	(1,517)	(544)	(3,959)	(1,660)
Operating Segments [Member]
Operating profits (losses):
Income (loss) from operations	22,829	5,176	76,803	15,387
Operating Segments [Member] \| Satellite Services [Member]
Revenues:
Product revenues	6,149	11	27,468	31
Service revenues	117,683	98,637	342,015	284,815
Total revenues	123,832	98,648	369,483	284,846
Operating profits (losses):
Income (loss) from operations	10,421	(9,761)	47,823	(37,377)
Operating Segments [Member] \| Commercial Networks [Member]
Revenues:
Product revenues	79,832	87,845	251,533	284,815
Service revenues	4,178	4,014	11,564	14,630
Total revenues	84,010	91,859	263,097	299,445
Operating profits (losses):
Income (loss) from operations	(7,558)	(6,528)	(20,801)	(3,558)
Operating Segments [Member] \| Government Systems [Member]
Revenues:
Product revenues	88,318	105,990	257,351	301,552
Service revenues	43,393	36,058	127,851	121,695
Total revenues	131,711	142,048	385,202	423,247
Operating profits (losses):
Income (loss) from operations	19,966	21,465	49,781	56,322
Corporate, Non-Segment [Member]
Operating profits (losses):
Income (loss) from operations
Intersegment Elimination [Member]
Revenues:
Total revenues
Operating profits (losses):
Income (loss) from operations
Material Reconciling Items [Member]
Operating profits (losses):
Amortization of acquired intangible assets	$ (4,651)	$ (3,652)	$ (13,338)	$ (10,949)

The net result for the period of deducting operating expenses from operating revenues.

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- Definition

Aggregate revenue during the period from the sale of goods in the normal course of business, after deducting returns, allowances and discounts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.1(a))

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

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- Definition

Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.1)

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Aggregate revenue during the period from services rendered in the normal course of business, after deducting allowances and discounts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

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-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.1(d))

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

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- Definition

The aggregate expense charged against earnings to allocate the cost of acquired intangible assets.

+ References

No definition available.

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