Composition Of Certain Financial Statement Captions (Schedule Of Accrued Liabilities) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 27, 2015	Sep. 26, 2014
Composition Of Certain Financial Statement Captions [Abstract]
Accrued royalties	$ 3,040us-gaap_AccruedRoyaltiesCurrent	$ 2,526us-gaap_AccruedRoyaltiesCurrent
Amounts payable to patent administration program partners	60,427	43,438
Accrued compensation and benefits	57,852us-gaap_AccruedEmployeeBenefitsCurrent	71,677us-gaap_AccruedEmployeeBenefitsCurrent
Accrued professional fees	4,386us-gaap_AccruedProfessionalFeesCurrent	6,162us-gaap_AccruedProfessionalFeesCurrent
Other accrued liabilities	63,802us-gaap_OtherAccruedLiabilitiesCurrent	34,573us-gaap_OtherAccruedLiabilitiesCurrent
Total	189,507us-gaap_AccruedLiabilitiesCurrent	158,376us-gaap_AccruedLiabilitiesCurrent
Capital expenditures incurred, but not yet paid		$ 8,700

Carrying value as of the balance sheet date of obligations, excluding pension and other postretirement benefits, incurred through that date and payable for perquisites provided to employees pertaining to services received from them. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Carrying value as of the balance sheet date of obligations incurred through that date and payable for professional fees, such as for legal and accounting services received. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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- Definition

Carrying value as of the balance sheet date of obligations incurred through that date and payable for royalties. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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- Definition

Carrying value as of the balance sheet date of obligations incurred through that date and payable arising from transactions not otherwise specified in the taxonomy. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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