Summary of Restructuring Accruals and Certain Facility Closures (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
Restructuring Reserve [Roll Forward]
Beginning balance	$ 1,732	$ 5,804
Expense Additions	4,130	2,719
Cash Payments	(5,600)	(6,538)
Expense Reversals	0	(253)
Ending balance	262	1,732
Less: current portion	(262)	(1,732)	(4,944)
Non-current	0	0	860
Facilities charges
Restructuring Reserve [Roll Forward]
Beginning balance	1,732	3,333
Expense Additions	167	1,624
Cash Payments	(1,807)	(3,225)
Expense Reversals	0	0
Ending balance	92	1,732
Employee separation
Restructuring Reserve [Roll Forward]
Beginning balance	0	2,471
Expense Additions	3,963	1,095	4,000
Cash Payments	(3,793)	(3,313)
Expense Reversals	0	(253)
Ending balance	$ 170	$ 0	$ 2,471