Plexus (PLXS) 10-K 2016 FY Annual report

																Exhibit 99.1
Return on Invested Capital ("ROIC") and Economic Return Calculations GAAP to non-GAAP reconciliation (dollars in millions):
				Fiscal year ended
				October 1, 2016			October 3, 2015			September 27, 2014
Operating income, as reported				$	99.4		$	115.4		$	100.6
Typhoon-related losses				2.9			—			—
Accelerated stock-based compensation expense				5.2
Restructuring and other charges				7.0			1.7			11.3
Adjusted operating income				114.6			115.4			100.6
Tax rate				11.0		%	11.0		%	11.0		%
Adjusted operating income (tax effected)				$	102.0		$	104.2		$	101.8
Average invested capital				$	740.0		$	745.6		$	669.6
ROIC				13.8		%	14.0		%	15.2		%
WACC				11.0		%	11.0		%	11.0		%
Economic Return				2.8		%	3.0		%	4.2		%
Average Invested Capital	Fiscal 2016
	Actual			Actual			Actual			Actual			Actual			Average invested capital
	10/1/2016			7/2/2016			4/2/2016			1/2/2016			10/3/2015
Equity	$	916.8		$	895.2		$	871.1		$	850.8		$	842.3
Plus:
Debt - current	78.5			78.3			2.3			2.9			3.5
Debt - non-current	184.0			184.5			259.6			259.3			259.3
Less:
Cash and cash equivalents	(433.0		)	(433.7		)	(409.8		)	(354.7		)	(357.1		)
	$	746.3		$	724.3		$	723.2		$	758.3		$	748.0		$	740.0
Average Invested Capital	Fiscal 2015
	Actual			Actual			Actual			Actual			Actual			Average invested capital
	10/3/2015			7/4/2015			4/4/2015			1/3/2015			9/27/2014
Equity	$	842.3		$	835.1		$	808.5		$	792.3		$	781.1
Plus:
Debt - current	3.5			4.3			4.8			4.8			4.4
Debt - non-current	259.3			259.3			260.0			261.0			262.0
Less:
Cash and cash equivalents	(357.1		)	(354.8		)	(356.3		)	(239.7		)	(346.6		)
	$	748.0		$	743.9		$	717.0		$	818.4		$	700.9		$	745.6
Average Invested Capital	Fiscal 2014
	Actual			Actual			Actual			Actual			Actual			Average invested capital
	9/27/2014			6/28/2014			3/29/2014			12/28/2013			9/28/2013
Equity	$	781.1		$	760.2		$	736.5		$	722.0		$	699.3
Plus:
Debt - current	4.4			4.2			3.9			3.8			3.6
Debt - non-current	262.0			263.1			256.1			256.9			257.8
Less:
Cash and cash equivalents	(346.6		)	(330.3		)	(323.7		)	(324.2		)	(341.9		)
	$	700.9		$	697.2		$	672.8		$	658.5		$	618.8		$	669.6