Description of business and summary of significant accounting policies (Tables)

12 Months Ended

Oct. 02, 2016

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Fair Value, Assets Measured on Recurring Basis

The following financial assets and liabilities were measured at fair value on a recurring basis using the type of inputs indicated below and are as follows (amounts in millions):

	Fair Value Measurements Using:
	Total		Level 1 Inputs		Level 2 Inputs		Level 3 Inputs
October 2, 2016
Investment in marketable securities	$	1.3	$	1.3	$	—	$	—
September 27, 2015
Investment in marketable securities	$	1.7	$	1.7	$	—	$	—

Earnings Per Share

Earnings per share for 2016, 2015 and 2014 were calculated as follows (amounts in millions, except per share data):

	Fiscal Years
	2016			2015		2014
Basic
Net (loss) income	$	(32.6	)	$	84.6	$	23.1
Weighted-average common shares outstanding	107.0			94.2		92.9
Basic (loss) earnings per share	$	(0.31	)	$	0.90	$	0.25
Diluted
Net (loss) income	$	(32.6	)	$	84.6	$	23.1
Weighted-average common shares outstanding for basic	107.0			94.2		92.9
Dilutive effect of stock awards	—			1.7		1.6
Weighted-average common shares outstanding on a diluted basis	107.0			95.9		94.5
Diluted (loss) earnings per share	$	(0.31	)	$	0.88	$	0.24