Summary of Depreciable Lives (Detail)	12 Months Ended
	Sep. 30, 2012
Buildings | Minimum
Property, Plant and Equipment [Line Items]
Depreciable lives	20 years
Buildings | Maximum
Property, Plant and Equipment [Line Items]
Depreciable lives	40 years
Computer equipment and software | Minimum
Property, Plant and Equipment [Line Items]
Depreciable lives	2 years
Computer equipment and software | Maximum
Property, Plant and Equipment [Line Items]
Depreciable lives	7 years
Machinery and equipment | Minimum
Property, Plant and Equipment [Line Items]
Depreciable lives	2 years
Machinery and equipment | Maximum
Property, Plant and Equipment [Line Items]
Depreciable lives	10 years
Furniture and fixtures | Minimum
Property, Plant and Equipment [Line Items]
Depreciable lives	3 years
Furniture and fixtures | Maximum
Property, Plant and Equipment [Line Items]
Depreciable lives	10 years