Stockholder's Equity (Details Textuals 4) - USD ($) $ in Millions	12 Months Ended
	Jul. 31, 2020	Jul. 31, 2019	Jul. 31, 2018
Equity [Abstract]
Share Based Compensation Arrangement By Share Based Payment Award Options In Money Number	8,058,644
Aggregate intrinsic value of options exercised	$ 476.3	$ 215.4	$ 111.5
Unrecognized total compensation cost related to non-vested stock-based awards	$ 49.5
Amortized cost on a straight-line basis over a weighted average term	3 years 5 months 26 days
Fair value of options vested	$ 19.2	$ 21.3	$ 19.1