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Taxes on Income - Narrative (Details) (USD $)
12 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2011
Income Tax Disclosure [Abstract]      
Benefits related to utilization of net operating loss carry-forwards $ 1,400,000 $ 500,000 $ 700,000
Tax benefits associated with stock-based compensation plans 24,400,000 22,000,000 16,300,000
Income Tax Holiday, Aggregate Dollar Amount 80,100,000 80,000,000 78,300,000
Income Tax Holiday, Income Tax Benefits Per Share $ 0.12 $ 0.12 $ 0.12
Foreign net operating loss carry-forwards 108,500,000    
Foreign net operating loss carry forwards expiration amount 60,000,000    
State net operating loss carry-forward expiration amount 148,900,000    
Valuation allowance 1,300,000 5,100,000  
Cumulative undistributed foreign earnings 6,400,000,000    
Accrued interest on uncertain tax positions 15,600,000 14,600,000  
Interest expense (benefit) recognized 1,000,000 (300,000) 3,200,000
Estimated decrease in unrecognized tax benefits within the next twelve months $ 6,500,000