Acquisitions - Company's Pro Forma Results (Detail) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended	9 Months Ended		15 Months Ended
	Jun. 30, 2013	Jun. 30, 2013	Jul. 01, 2012	Jul. 01, 2013
Business Acquisition Actual Revenue And Pre Tax Income Loss [Line Items]
Document Period End Date		Jun. 30, 2013
Revenues:
Pro forma revenues	$ 1,410.6	$ 4,290.3	$ 4,115.6	$ 1,297.3
Net income:
Pro forma net income	118.7	140.7	(20.4)	(88.9)
Basic net income per common share attributable to controlling interest:
Pro forma net income per common share (in dollars per share)	$ 0.45	$ 0.58	$ (0.61)	$ (0.92)
Diluted (in dollars per share)	$ 0.25	$ 0.30	$ (0.93)	$ (1.07)
Basic (in dollars per share)	$ 0.45	$ 0.54	$ (0.93)	$ (1.07)
Pro forma diluted net income per common share (in dollars per share)	$ 0.25	$ 0.32	$ (0.61)	$ (0.92)
Reported Revenues [Member]
Revenues:
Pro forma revenues	1,410.6	4,044.8	3,283.9	1,012.2
Net income:
Pro forma net income	118.7	136.3	(64.8)	(110.1)
HHI Business [Member] | HHI adjustment [Member]
Revenues:
Pro forma revenues		191.8	716.9	253.0
Net income:
Pro forma net income		4.9	49.6	26.7
Basic net income per common share attributable to controlling interest:
Pro forma net income per common share (in dollars per share)		$ 0.04	$ 0.36	$ 0.19
Pro forma diluted net income per common share (in dollars per share)		$ 0.02	$ 0.36	$ 0.19
EXCO/HGI JV [Member] | HHI adjustment [Member]
Revenues:
Pro forma revenues		53.7	114.8	32.1
Net income:
Pro forma net income		$ (0.5)	$ (5.2)	$ (5.5)
Basic net income per common share attributable to controlling interest:
Pro forma net income per common share (in dollars per share)		$ 0.00	$ (0.04)	$ (0.04)
Pro forma diluted net income per common share (in dollars per share)		$ 0.00	$ (0.04)	$ (0.04)