Summary of Restructuring Accruals and Certain Facility Closures (Detail) (USD $) In Thousands, unless otherwise specified	6 Months Ended
Mar. 31, 2012	Sep. 30, 2011
Restructuring Cost and Reserve [Line Items]
Beginning balance	$ 6,396
Expense Additions
Cash Payments	(2,066)
Ending balance	4,330
Less: current portion	(2,779)	(3,062)
Non-current	1,551	3,334
Facilities charges
Restructuring Cost and Reserve [Line Items]
Beginning balance	5,362
Expense Additions
Cash Payments	(1,032)
Ending balance	4,330
Employee separation
Restructuring Cost and Reserve [Line Items]
Beginning balance	1,034
Expense Additions
Cash Payments	(1,034)
Ending balance

Carrying amount as of the balance sheet date of known and estimated obligations associated with exit from or disposal of business activities or restructurings pursuant to a duly authorized plan, which are expected to be paid in the next twelve months or in the normal operating cycle if longer. Costs of such activities include those for one-time termination benefits, termination of an operating lease or other contract, consolidating or closing facilities, relocating employees, and costs associated with an ongoing benefit arrangement, but excludes costs associated with the retirement of a long-lived asset.

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Carrying amount as of the balance sheet date of known and estimated costs associated with exit from or disposal of business activities or restructurings pursuant to a duly authorized plan, which are expected to be paid after one year or beyond the next operating cycle, if longer. Costs of such activities include those for one-time termination benefits, termination of an operating lease or other contract, consolidating or closing facilities, and relocating employees, and costs associated with an ongoing benefit arrangement, but excludes costs associated with the retirement of a long-lived asset.

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- Definition

Amount of cash paid in the period to fully or partially settle a specified, previously accrued type of restructuring cost.

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