Intangible Assets (Narrative) (Details) - USD ($)	3 Months Ended	9 Months Ended
	Apr. 30, 2018	Jul. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill, Impairment Loss	$ 24,400,000	$ 0
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
2018		36,300,000
2019		143,300,000
2020		133,400,000
2021		132,200,000
2022		130,300,000
Thereafter		974,400,000
Finite-Lived Intangible Assets, Net		$ 1,549,900,000