Fair Value Measurements - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Jun. 28, 2013	Jun. 28, 2013 Level 2 [Member]	Mar. 29, 2013 Level 2 [Member]	Jun. 28, 2013 Level 1 [Member] Fair Value, Measurements, Recurring [Member] 2020 Notes [Member]	Mar. 29, 2013 Level 1 [Member] Fair Value, Measurements, Recurring [Member] 2020 Notes [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of Senior Notes				$ 606.6	$ 616.7
Interest on satellite in orbital performance obligation	7.00%
Period of in orbit performance incentive payments including interest	15 years
Satellite orbital performance payables current and non current		$ 22.8	$ 22.7