Investments in Affiliates (Details) - USD ($) $ in Millions	12 Months Ended
Jul. 31, 2018	Jul. 31, 2017	Jul. 31, 2016
Investments in equity method affiliates	$ 7.7	$ 7.6
Undistributed earnings of equity method affiliates	4.4	4.3
Distributions received from equity method affiliates	$ 1.5	$ 1.9	$ 1.3
Slifer, Smith, and Frampton/Vail Associates Real Estate, LLC ("SSF/VARE") [Member]
Ownership interest	50.00%
KRED [Member]
Ownership interest	50.00%
Clinton Ditch and Reservoir Company [Member]
Ownership interest	43.00%
Slifer Smith and Frampton and Vail Associates Real Estate Llc Ssf and Vare [Member]
Real estate revenue from leases	$ 0.4
Ownership interest	50.00%

Amount of distribution received from equity method investee for return on investment, classified as operating activities. Excludes distribution for return of investment, classified as investing activities.

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