Summary of Depreciable Lives (Detail)	12 Months Ended
	Sep. 30, 2011 Year
Buildings
Property, Plant and Equipment [Line Items]
Depreciable lives, minimum	20
Depreciable lives, maximum	40
Computer equipment and software
Property, Plant and Equipment [Line Items]
Depreciable lives, minimum	2
Depreciable lives, maximum	7
Machinery and equipment
Property, Plant and Equipment [Line Items]
Depreciable lives, minimum	2
Depreciable lives, maximum	10
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Depreciable lives, minimum	3
Depreciable lives, maximum	10