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Fair Value Measurements (Schedule Of Changes In The Fair Value Of The Level 3 Financial Assets And Liabilities) (Details) (Significant Unobservable Inputs (Level 3) [Member], USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Oct. 31, 2011
Oct. 31, 2010
Oct. 31, 2011
Oct. 31, 2010
Significant Unobservable Inputs (Level 3) [Member]
       
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Beginning balance, Asset $ 52,612 $ 69,349 $ 73,163 $ 114,650
Sales and redemptions, Asset (250) (2,522) (25,750) (57,018)
Change in realized and unrealized gains included in other income, net, Asset 120 1,625 8,011 23,715
Change in unrealized losses included in other comprehensive income, Asset (1,463) 1,143 (4,443) (11,374)
Impairment charges, Asset   (29)   (407)
Change in fair value recorded in operating expenses, Asset 20   58  
Ending balance, Asset 51,039 69,566 51,039 69,566
Beginning balance, Liability 2,364 3,306 3,686  
Contingent consideration liability recorded for business combination, Liability 32,800   33,704 3,224
Payments of contingent consideration, Liability     (4,107)  
Change in fair value recorded in operating expenses, Liability (541) 141 1,340 223
Ending balance, Liability $ 34,623 $ 3,447 $ 34,623 $ 3,447