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Comprehensive Income (Schedule Of Reclassifications Of Recognized Transactions Out Of AOCI) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Mar. 31, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Other (loss) income, net | $ (5.8) | $ 1.3 | $ 8.9
Income tax provision | (481.9) | 80.8 | 42.6
Net income attributable to Microchip Technology | 255.4 | 164.6 | 324.1
Reclassification out of Accumulated Other Comprehensive Income | Accumulated Net Unrealized Investment Gain (Loss) |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Other (loss) income, net | (15.5) | (1.5) | 10.9
Income tax provision | 0.3 | 0.0 | 0.0
Net income attributable to Microchip Technology | (16.0) | (1.5) | 10.9
Reclassification out of Accumulated Other Comprehensive Income | Accumulated Defined Benefit Plans Adjustment |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Other (loss) income, net | $ (0.8) | $ 0.0 | $ 0.0

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