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Debt - Components of Debt (Detail) (USD $) In Millions, unless otherwise specified	Sep. 27, 2014	Dec. 28, 2013	Dec. 28, 2013 8.375% Senior Notes Due in 2017 [Member]	Dec. 28, 2013 8.125% Senior Notes Due in 2018 [Member]	Sep. 27, 2014 5.375% Senior Notes Due in 2022 [Member]	Jun. 24, 2014 5.375% Senior Notes Due in 2022 [Member]
Debt Instrument [Line Items]
Senior notes			$ 15.0	$ 375.0	$ 525.0	$ 525.0
ABL facility	69.3	50.8
GE Term loan	8.9	10.3
Capital lease obligations and other debt	5.7	7.2
Total debt	608.9	458.3
Total short-term borrowings	69.3	50.8
GE Term loan, current maturities	2.0	1.9
Capital lease obligations and other debt, current maturities	2.1	2.0
Total current debt	73.4	54.7
Long-term debt before discount	535.5	403.6
Less discount on 8.375% notes		(0.1)
Total long-term debt	$ 535.5	$ 403.5