Restructuring and Other Charges Activity Related to Restructuring Accruals (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2013	Mar. 31, 2012
Restructuring Reserve [Roll Forward]
Beginning Balance	$ 4,793		$ 2,098
Expense	769		5,439
Utilization	(2,982)		(4,957)
Ending Balance	2,580		2,580
Facilities and Other
Restructuring Reserve [Roll Forward]
Beginning Balance	265		0
Expense	112		690
Utilization	(144)		(457)
Ending Balance	233		233
Workforce-related
Restructuring Reserve [Roll Forward]
Beginning Balance	4,528	321	2,098	293
Expense	657	42	4,749	245
Utilization	(2,838)	(243)	(4,500)	(418)
Ending Balance	$ 2,347	$ 120	$ 2,347	$ 120