Quarterly Results (Unaudited) (Tables)

12 Months Ended

Mar. 31, 2018

Quarterly Financial Information Disclosure [Abstract]

Schedule of Quarterly Financial Data

The following table presents the Company's selected unaudited quarterly operating results for the eight quarters ended March 31, 2018.  The Company believes that all adjustments of a normal recurring nature have been made to present fairly the related quarterly results (in millions, except per share amounts. Amounts may not add to the total due to rounding):

Fiscal 2018	First Quarter			Second Quarter		Third Quarter			Fourth Quarter		Total
Net sales	$	972.1		$	1,012.1	$	994.2		$	1,002.3	$	3,980.8
Gross profit	584.4			614.1		607.1			615.1		2,420.7
Operating income	221.6			225.4		245.2			244.1		936.3
Net income (loss) attributable to Microchip Technology	170.6			189.2		(251.1		)	146.7		255.4
Diluted net income (loss) per common share attributable to Microchip Technology stockholders	0.70			0.77		(1.07		)	0.58		1.03
Fiscal 2017	First Quarter			Second Quarter		Third Quarter			Fourth Quarter		Total
Net sales	$	799.4		$	871.4	$	834.4		$	902.7	$	3,407.8
Gross profit	348.5			410.6		465.3			532.8		1,757.2
Operating income (loss)	(59.1		)	62.8		118.1			154.1		275.8
Net income (loss) attributable to Microchip Technology	(113.4		)	33.9		107.2			136.9		164.6
Diluted net income (loss) per common share attributable to Microchip Technology stockholders	(0.53		)	0.14		0.46			0.57		0.71