Noncontrolling Interests Change in Parent Ownership (Details) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Net income attributable to Microchip Technology stockholders	$ 130,667	$ 89,909
Parent [Member]
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Net income attributable to Microchip Technology stockholders	130,667
Decrease in paid-in capital for purchase of additional interests	(1,610)
Transfers from noncontrolling interest	(1,610)
Change from net income attributable to Microchip Technology stockholders and transfers from noncontrolling interest	$ 129,057