Contingencies And Other Disclosures (Schedule Of Original Purchase Amount Of Investments Subject To Litigation) (Details)	Sep. 25, 2015 USD ($)
Alternativea Mortgage Loan Pools [Member]
Loss Contingencies [Line Items]
Original purchase amounts of the investments at issue	$ 727,042,000
Ending balance of the investments at issue	197,431,000
Alternativea Mortgage Loan Pools [Member] | 2005 [Member]
Loss Contingencies [Line Items]
Original purchase amounts of the investments at issue	202,417,000
Ending balance of the investments at issue	44,100,000
Alternativea Mortgage Loan Pools [Member] | 2006 [Member]
Loss Contingencies [Line Items]
Original purchase amounts of the investments at issue	325,613,000
Ending balance of the investments at issue	78,934,000
Alternativea Mortgage Loan Pools [Member] | 2007 [Member]
Loss Contingencies [Line Items]
Original purchase amounts of the investments at issue	199,012,000
Ending balance of the investments at issue	74,397,000
Jumbo Mortgage Loans [Member]
Loss Contingencies [Line Items]
Original purchase amounts of the investments at issue	32,540,000
Ending balance of the investments at issue	7,273,000
Jumbo Mortgage Loans [Member] | 2005 [Member]
Loss Contingencies [Line Items]
Original purchase amounts of the investments at issue	0
Ending balance of the investments at issue	0
Jumbo Mortgage Loans [Member] | 2006 [Member]
Loss Contingencies [Line Items]
Original purchase amounts of the investments at issue	32,540,000
Ending balance of the investments at issue	7,273,000
Jumbo Mortgage Loans [Member] | 2007 [Member]
Loss Contingencies [Line Items]
Original purchase amounts of the investments at issue	0
Ending balance of the investments at issue	$ 0