Segment Information - Revenue Information by Geographic Area (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Sep. 28, 2012	Sep. 30, 2011	Sep. 28, 2012	Sep. 30, 2011
Segment Reporting Information [Line Items]
Revenue information by geographic area - United States	$ 206,490	$ 175,760	$ 385,224	$ 329,961
Total revenues	282,822	223,024	524,585	418,125
Europe, Middle East and Africa [Member]
Segment Reporting Information [Line Items]
Revenue information by geographic area	54,330	30,336	86,545	57,240
Asia, Pacific [Member]
Segment Reporting Information [Line Items]
Revenue information by geographic area	12,461	4,819	20,892	11,997
North America Other Than United States [Member]
Segment Reporting Information [Line Items]
Revenue information by geographic area	6,900	5,489	24,287	9,713
Central and Latin America [Member]
Segment Reporting Information [Line Items]
Revenue information by geographic area	$ 2,641	$ 6,620	$ 7,637	$ 9,214