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Comprehensive Income (Schedule of Reclassifications of Recognized Transactions out of AOCI) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2014	Dec. 31, 2013
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other Nonoperating Income (Expense)	$ (2,457)us-gaap_OtherNonoperatingIncomeExpense	$ 3,824us-gaap_OtherNonoperatingIncomeExpense	$ (3,535)us-gaap_OtherNonoperatingIncomeExpense	$ 6,093us-gaap_OtherNonoperatingIncomeExpense
Income Tax Expense (Benefit)	(1,393)us-gaap_IncomeTaxExpenseBenefit	(7,187)us-gaap_IncomeTaxExpenseBenefit	(17,141)us-gaap_IncomeTaxExpenseBenefit	(30,344)us-gaap_IncomeTaxExpenseBenefit
Net income attributable to Microchip Technology	86,057us-gaap_NetIncomeLoss	105,401us-gaap_NetIncomeLoss	269,607us-gaap_NetIncomeLoss	283,786us-gaap_NetIncomeLoss
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)	73	113	169	2,279
Income Tax Expense (Benefit)	0	0	(12)	(776)
Net income attributable to Microchip Technology	$ 73	$ 113	$ 157	$ 1,503

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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