Subsequent Events (Details) (USD $)	6 Months Ended		3 Months Ended	6 Months Ended		1 Months Ended	3 Months Ended	6 Months Ended	3 Months Ended
	Sep. 30, 2012	Oct. 02, 2011	Sep. 30, 2012 NXP B.V [Member]	Sep. 30, 2012 NXP B.V [Member]	Jul. 19, 2012 NXP B.V [Member]	Apr. 30, 2012 PLX Technology [Member] Proposed Acquisition [Member]	Sep. 30, 2012 PLX Technology [Member] Proposed Acquisition [Member]	Sep. 30, 2012 PLX Technology [Member] Proposed Acquisition [Member]	Sep. 30, 2012 Synaptics asset purchase agreement [Member]	Aug. 01, 2012 Synaptics asset purchase agreement [Member] Employees	Jul. 01, 2012 Fixed Assets [Member]	Jul. 01, 2012 Intangible Assets [Member]
Subsequent Event [Line Items]
Total purchase price					$ 27,162,000
Business Combination, Acquisition Related Costs			1,800,000	3,900,000			3,100,000	7,200,000
Assets Held-for-sale, Long Lived											1,000,000	700,000
Proceeds from divestitures	5,000,000	51,670,000							5,000,000
Employees transferred to Synaptics										47
Par value of PLX common stock						$ 0.001
Cost of Acquired Entity, Cash Paid Per Share						$ 3.50
Number of IDT shares issued per acquired share of PLX common stock						0.525