Cash Received and Cash Paid (Detail) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Dec. 28, 2012	Dec. 30, 2011
Loral - beam sharing agreement [Member]
Cash received and cash paid
Cash received		$ 3,845
Telesat Canada-beam sharing agreement [Member]
Cash received and cash paid
Cash received		8,085
Telesat Canada-ordinary course of business [Member]
Cash received and cash paid
Cash received		2,843
Cash paid	5,721	5,707
Loral - satellite construction contract [Member]
Cash received and cash paid
Cash paid	$ 1,067	$ 2,566