Comprehensive Income (Loss) (Schedule of Reclassifications of Recognized Transactions out of AOCI) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other Nonoperating Income (Expense)	$ (1,696)	$ (1,091)	$ 15,251	$ (1,078)
Income Tax Expense	10,942	1,334	21,837	(15,748)
Net income attributable to Microchip Technology	64,899	93,641	195,566	183,550
Accumulated Net Unrealized Investment Gain (Loss) [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other Nonoperating Income (Expense)	6	62	13,965	96
Income Tax Expense	0	0	0	(12)
Net income attributable to Microchip Technology	$ 6	$ 62	$ 13,965	$ 84