Segment Information - Additional Information (Detail)	12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Segment Reporting, Revenue Reconciling Item [Line Items]
Number of reporting segments	3
Entity-Wide Revenue, Major Customer, Percentage	More than 10%
Outside the U.S. | Sales
Segment Reporting, Revenue Reconciling Item [Line Items]
Entity-Wide Revenue, Major Customer, Percentage	43.00%	36.00%	25.00%
IRELAND | Sales
Segment Reporting, Revenue Reconciling Item [Line Items]
Entity-Wide Revenue, Major Customer, Percentage	19.00%	17.00%
BELGIUM | Sales
Segment Reporting, Revenue Reconciling Item [Line Items]
Entity-Wide Revenue, Major Customer, Percentage		12.00%