Summary of Restructuring Accruals and Certain Facility Closures (Detail) (USD $) In Thousands	9 Months Ended
	Jun. 30, 2011	Jun. 30, 2011 Facilities charges	Jun. 30, 2011 Employee separation	Jun. 30, 2011 Less	Sep. 30, 2010 Less	Jun. 30, 2011 Non-current	Sep. 30, 2010 Non-current
Restructuring Cost and Reserve [Line Items]
Beginning Balance	$ 3,578	$ 2,836	$ 742	$ (3,149)	$ (1,474)	$ 4,010	$ 2,104
Expense Additions	12,391	4,226	8,165
Cash Payments	(8,810)	(1,007)	(7,803)
Ending Balance	$ 7,159	$ 6,055	$ 1,104	$ (3,149)	$ (1,474)	$ 4,010	$ 2,104