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Restructuring and Other Charges Activity Related to Restructuring Accruals (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended			6 Months Ended
	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014	Mar. 31, 2015	Mar. 31, 2014
Restructuring Reserve [Roll Forward]
Beginning Balance	$ 3,928us-gaap_RestructuringReserve	$ 3,475us-gaap_RestructuringReserve	$ 1,462us-gaap_RestructuringReserve	$ 3,475us-gaap_RestructuringReserve	$ 1,412us-gaap_RestructuringReserve
Expense	685us-gaap_RestructuringCharges	2,700us-gaap_RestructuringCharges	772us-gaap_RestructuringCharges	3,353us-gaap_RestructuringCharges	1,519us-gaap_RestructuringCharges
Utilization	(1,316)us-gaap_PaymentsForRestructuring		(682)us-gaap_PaymentsForRestructuring	(3,531)us-gaap_PaymentsForRestructuring	(1,379)us-gaap_PaymentsForRestructuring
Ending Balance	3,297us-gaap_RestructuringReserve	3,928us-gaap_RestructuringReserve	1,552us-gaap_RestructuringReserve	3,297us-gaap_RestructuringReserve	1,552us-gaap_RestructuringReserve
Facilities and other
Restructuring Reserve [Roll Forward]
Beginning Balance	1,175	71	57	71	155
Expense	0	1,200	7	1,205	13
Utilization	(271)		(64)	(372)	(168)
Ending Balance	904	1,175	0	904	0
Workforce-related
Restructuring Reserve [Roll Forward]
Beginning Balance	2,753	3,404	1,405	3,404	1,257
Expense	685	1,500	765	2,148	1,506
Utilization	(1,045)		(618)	(3,159)	(1,211)
Ending Balance	$ 2,393	$ 2,753	$ 1,552	$ 2,393	$ 1,552

- Definition

Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

+ References+ Details