Activity Related to Restructuring Accruals (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Restructuring Cost and Reserve [Line Items]
Beginning Balance		$ 3,509
Restructuring expense		214
Utilization		(1,198)
Ending Balance		2,525
Workforce-related
Restructuring Cost and Reserve [Line Items]
Beginning Balance	293
Restructuring expense	203	165
Utilization	(175)	(165)
Ending Balance	321
Facilities and other
Restructuring Cost and Reserve [Line Items]
Beginning Balance		3,509
Restructuring expense		49
Utilization		(1,033)
Ending Balance		$ 2,525