Acquisitions - Company's Pro Forma Results (Detail) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Basic net income per common share attributable to controlling interest:
Diluted (in dollars per share)	$ (0.38)	$ 0.28	$ (2.09)	$ (0.52)
Basic (in dollars per share)	$ (0.38)	$ 0.28	$ (2.09)	$ (0.52)
Revenues	$ 1,553.5	$ 1,599.4	$ 4,363.4	$ 4,450.6