Summary of Significant Accounting Policies (Details) - USD ($) $ in Millions	9 Months Ended
	Apr. 30, 2018	Apr. 30, 2017
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Increase to net cash provided by operating activities	$ 158.7	$ 230.8
Increase to net cash provided by financing activities	$ (84.1)	(124.4)
Accounting Standards Update 2016-09
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Increase to net cash provided by operating activities		6.7
Increase to net cash provided by financing activities		$ 6.7