Income Taxes Unrecognized tax benefits (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Sep. 28, 2012	Sep. 30, 2011
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Gross unrecognized tax benefits	$ 34,040	$ 49,274
Additions based on tax positions taken in the current year	2,304	3,353
Additions (Reductions) for tax positions taken in prior years	(254)	1,312
Reductions for remeasurements, settlements and payments	(3,306)	(19,331)
Reductions due to statute expiration	(807)	(568)
Gross unrecognized tax benefits	$ 31,977	$ 34,040

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The gross amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns as of the balance sheet date.

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The gross amount of decreases in unrecognized tax benefits resulting from settlements with taxing authorities.

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The gross amount of increases in unrecognized tax benefits resulting from tax positions that have been or will be taken in the tax return for the current period, excluding amounts pertaining to examined tax returns.

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