Net Sales by Product Line (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Sep. 30, 2012	Oct. 02, 2011	Sep. 30, 2012	Oct. 02, 2011
Operating Statistics [Line Items]
Total net sales	$ 30,622	$ 36,120	$ 59,873	$ 73,098
Connectivity [Member]
Operating Statistics [Line Items]
Total net sales	16,352	18,788	32,380	37,826
Power management [Member]
Operating Statistics [Line Items]
Total net sales	6,793	7,831	13,395	15,128
Data Compression And Security [Member]
Operating Statistics [Line Items]
Total net sales	4,538	4,959	8,227	8,853
Communications [Member]
Operating Statistics [Line Items]
Total net sales	$ 2,939	$ 4,542	$ 5,871	$ 11,291