Goodwill and Acquired Intangible Assets - Additional Information (Detail) (USD $)	3 Months Ended		6 Months Ended
	Oct. 03, 2014	Oct. 04, 2013	Oct. 03, 2014	Oct. 04, 2013
Goodwill And Other Intangible Asset [Line Items]
Change in goodwill			$ 34,000,000
Amortization of acquired intangible assets	4,658,000	3,796,000	8,687,000	7,297,000
Government Systems [Member]
Goodwill And Other Intangible Asset [Line Items]
Amortization of acquired intangible assets	1,520,000	522,000	2,442,000	1,115,000
Minimum [Member]
Goodwill And Other Intangible Asset [Line Items]
Other acquired intangible assets estimated useful lives			2 years
Maximum [Member]
Goodwill And Other Intangible Asset [Line Items]
Other acquired intangible assets estimated useful lives			10 years
NetNearU [Member] | Government Systems [Member]
Goodwill And Other Intangible Asset [Line Items]
Change in goodwill related to an acquisition			$ 34,300,000