Activity Related to Restructuring Accruals (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Restructuring Cost and Reserve [Line Items]
Beginning Balance		$ 1,553		$ 3,509
Restructuring expense	880	97	1,125	557
Utilization		(1,084)		(3,500)
Ending Balance		566		566
Workforce-related
Restructuring Cost and Reserve [Line Items]
Beginning Balance	120		293
Restructuring expense	880	73	1,125	346
Utilization	(249)	(73)	(667)	(346)
Ending Balance	751		751
Facilities and other
Restructuring Cost and Reserve [Line Items]
Beginning Balance		1,553		3,509
Restructuring expense		24		211
Utilization		(1,011)		(3,154)
Ending Balance		$ 566		$ 566