Intangible Assets And Goodwill (Range Of Remaining Estimated Useful Lives And Weighted-Average Amortization) (Details)	12 Months Ended
	Aug. 31, 2018
License Rights [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted Average Original Amortization Period	30 years
Acquired Content [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted Average Original Amortization Period	25 years
Customer Lists [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted Average Original Amortization Period	12 years
Acquired Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Range of Remaining Estimated Useful Lives	2 years
Weighted Average Original Amortization Period	3 years
Trade Names [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted Average Original Amortization Period	5 years
Non-Compete Agreements And Other [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted Average Original Amortization Period	4 years
Minimum [Member] | License Rights [Member]
Finite-Lived Intangible Assets [Line Items]
Range of Remaining Estimated Useful Lives	4 years
Minimum [Member] | Acquired Content [Member]
Finite-Lived Intangible Assets [Line Items]
Range of Remaining Estimated Useful Lives	1 year
Minimum [Member] | Customer Lists [Member]
Finite-Lived Intangible Assets [Line Items]
Range of Remaining Estimated Useful Lives	1 year
Minimum [Member] | Trade Names [Member]
Finite-Lived Intangible Assets [Line Items]
Range of Remaining Estimated Useful Lives	1 year
Minimum [Member] | Non-Compete Agreements And Other [Member]
Finite-Lived Intangible Assets [Line Items]
Range of Remaining Estimated Useful Lives	1 year
Maximum [Member] | License Rights [Member]
Finite-Lived Intangible Assets [Line Items]
Range of Remaining Estimated Useful Lives	8 years
Maximum [Member] | Acquired Content [Member]
Finite-Lived Intangible Assets [Line Items]
Range of Remaining Estimated Useful Lives	8 years
Maximum [Member] | Customer Lists [Member]
Finite-Lived Intangible Assets [Line Items]
Range of Remaining Estimated Useful Lives	9 years
Maximum [Member] | Trade Names [Member]
Finite-Lived Intangible Assets [Line Items]
Range of Remaining Estimated Useful Lives	4 years
Maximum [Member] | Non-Compete Agreements And Other [Member]
Finite-Lived Intangible Assets [Line Items]
Range of Remaining Estimated Useful Lives	9 years