Restructuring and Other Charges - Activity Related to Restructuring Accruals (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Restructuring Reserve [Roll Forward]
Beginning Balance	$ 2,098		$ 3,509
Expense	6,378		1,036
Utilization	(7,064)		(4,252)
Ending Balance	1,412		293
Facilities and other
Restructuring Reserve [Roll Forward]
Beginning Balance	0		3,509
Expense	818		310
Utilization	(663)		(3,819)
Ending Balance	155		0
Workforce-related
Restructuring Reserve [Roll Forward]
Beginning Balance	2,098	293	0
Expense	5,560	3,275	726
Utilization	(6,401)	(1,470)	(433)
Ending Balance	$ 1,257	$ 2,098	$ 293