Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Segment reporting information [Line Items]
Net Sales	$ 871,364	$ 541,391	$ 1,670,775	$ 1,075,343
Gross Profit	410,621	300,950	759,111	609,967
Semiconductor products
Segment reporting information [Line Items]
Net Sales	847,694	518,216	1,626,517	1,028,905
Gross Profit	386,951	277,775	714,853	563,529
Technology licensing
Segment reporting information [Line Items]
Net Sales	23,670	23,175	44,258	46,438
Gross Profit	$ 23,670	$ 23,175	$ 44,258	$ 46,438