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Segment Information (Reconciliation Of Segment Information To The Company's Net Income before Income Taxes) (Details) (USD $)
In Thousands
3 Months Ended12 Months Ended
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2010
Sep. 30, 2010
Mar. 31, 2010
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2009
Segment Information        
Segment operating result     $ 79,536$ 65,600$ 59,002
Amortization of intangible assets     (12,912)(4,506)(6,050)
Stock-based compensation     (57,875)(46,831)(32,653)
Transaction costs (1,481)(990)(663) (2,471)(663) 
Tax accrual reversal  (3,942) (3,089) 3,089 
Litigation benefit    (7,000) 7,000 
Restructuring costs(13,396)(231)2,923 (8,579)(10,704)(8,579)(10,157)
Other-than-temporary decline in long-term investment       (1,414)
Purchase accounting adjustment to revenues       (355)
Operating (loss) income     (4,426)15,1108,373
Interest and other income (expense), net     2,039(617)(5,613)
(Loss) income from continuing operations before income taxes     $ (2,387)$ 14,493$ 2,760