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Fair Value Of Financial Assets And Financial Liabilities (Reconciliation Of Beginning And Ending ARS Balances) (Details) (Level 3 [Member], Auction Rate Securities [Member], USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended 12 Months Ended
Oct. 31, 2011
Oct. 31, 2010
Oct. 31, 2011
Oct. 31, 2010
Jan. 31, 2011
Level 3 [Member] | Auction Rate Securities [Member]
         
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]          
Balance at beginning of period $ 23,504 $ 31,457 $ 29,462 $ 33,505 $ 33,505
Total gains realized/unrealized, Included in earnings               
Total gains realized/unrealized, Included in other comprehensive income 327 161 1,094 413 332
Settlements (2,875) (1,475) (9,600) (3,775) (4,375)
Transfers in and/or out of Level 3               
Balance at end of period 20,956 30,143 20,956 30,143 29,462
Unrealized losses included in accumulated other comprehensive loss related to assets still held at reporting date (2,694) (3,707) (2,694) (3,707) (3,788)
Total gains for the period included in earnings attributable to the change in unrealized gains or losses related to assets still held at reporting date