Summary of Restructuring Accruals and Certain Facility Closures (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2009
Restructuring Cost and Reserve [Line Items]
Beginning balance	$ 6,396	$ 3,578	$ 3,771
Expense Additions	3,978	12,391	1,617
Cash Payments	(4,570)	(9,573)	(1,810)
Expense Reversals
Ending balance	5,804	6,396	3,578
Less: current portion	(4,944)	(3,062)	(1,474)	(1,361)
Non-current	860	3,334	2,104	2,410
Facilities charges
Restructuring Cost and Reserve [Line Items]
Beginning balance	5,362	2,836	3,771
Expense Additions		4,226	875
Cash Payments	(2,029)	(1,700)	(1,810)
Expense Reversals
Ending balance	3,333	5,362	2,836
Employee separation
Restructuring Cost and Reserve [Line Items]
Beginning balance	1,034	742
Expense Additions	3,978	8,165	742
Cash Payments	(2,541)	(7,873)
Expense Reversals
Ending balance	$ 2,471	$ 1,034	$ 742

Amount charged against earnings in the period for incurred and estimated costs associated with exit from or disposal of business activities or restructurings pursuant to a duly authorized plan, excluding asset retirement obligations.

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Amount of any reversal and other adjustment made during the period to the amount of a previously accrued liability for a specified type of restructuring cost, excluding adjustments for costs incurred during the period, costs settled during the period, and foreign currency translation adjustments.

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- Definition

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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- Definition

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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