Contingencies - Additional Information (Detail) - RTI Technologies - USD ($) $ in Millions				3 Months Ended
	Jan. 15, 2015	Sep. 19, 2013	Nov. 09, 2009	Sep. 30, 2013
Loss Contingencies [Line Items]
Damages awarded	$ 341.0	$ 113.5	$ 5.0
Pre-tax charge relating to an unfavorable litigation verdict				$ 341.0
Professional fees	$ 12.0