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Derivatives and Hedging (Details Textuals) $ in Millions	12 Months Ended
	Jul. 31, 2018 USD ($) Derivative	Jul. 31, 2017 USD ($) Derivative	Jul. 31, 2016 USD ($) Derivative
Derivative [Line Items]
Number of interest rate derivatives held | Derivative	0	0	2
Interest Rate Swap [Member]
Derivative [Line Items]
Derivative, type of instrument			interest rate swaps
Amount reclassified into earnings | $	$ 0.0	$ 0.0	$ 0.5
Description of interest rate cash flow hedge accounting method			hypothetical derivative method

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General discussion of the accounting for interest rate derivatives designated as hedging instruments in cash flow hedges. Includes discussion of where derivatives and the gain (loss) on derivatives are reported in the financial statements. Also includes discussion of the assessment of hedge effectiveness and measurement of hedge ineffectiveness.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(n)(1),(3),(7))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

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-Topic 815
-SubTopic 10
-Section 50
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Description of the types of interest rate derivative instruments designated as hedging instruments in cash flow hedges. For example, swaps, caps, floors, and collars.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(n)(2))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

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The amount of net gains or losses on interest rate cash flow hedges reclassified during the period to earnings from accumulated other comprehensive income upon the hedged transaction affecting earnings.

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-Publisher FASB
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-SubTopic 10
-Section 50
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Number of interest rate derivative instruments held by the entity at the reporting date.

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