Contingencies And Other Disclosures (Schedule Of Original Purchase Amount Of Investments Subject To Litigation) (Details) (USD $)	Mar. 25, 2015
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	217,072,000
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	49,500,000
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	85,171,000
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	82,401,000
Jumbo Mortgage Loans [Member]
Loss Contingencies [Line Items]
Original purchase amounts of the investments at issue	82,540,000
Ending balance of the investments at issue	22,045,000
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	7,769,000
Jumbo Mortgage Loans [Member] | 2007 [Member]
Loss Contingencies [Line Items]
Original purchase amounts of the investments at issue	50,000,000
Ending balance of the investments at issue	$ 14,276,000