Stock-Based Compensation Performance Based Restricted Shares and Restricted Stock Units (Details)	3 Months Ended
Oct. 31, 2020 $ / shares shares
Service Based Restricted Shares and Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding at July 31, 2020 \| shares	154,960
Outstanding at July 31, 2020, Weighted Average Grant Date Fair Value \| $ / shares	$ 47.39
Performance-Based RSUs, Grants in Period \| shares	75,352
Performance-Based RSUs, Grants in Period, Weighted Average Grant Date Fair Value \| $ / shares	$ 39.92
Performance-Based RSUs, Vested in Period \| shares	(63,339)
Performance-Based RSUs, Vested in Period, Weighted Average Grant Date Fair Value \| $ / shares	$ 44.85
Performance-Based RSUs, Forfeited in Period \| shares	0
Performance-Based RSUs, Forfeitures, Weighted Average Grant Date Fair Value \| $ / shares	$ 0
Outstanding at October 31, 2020 \| shares	166,973
Outstanding at October 31, 2020, Weighted Average Grant Date Fair Value \| $ / shares	$ 44.98
Performance Based Restricted Shares and Restricted Stock Units [Member] [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding at July 31, 2020 \| shares	126,060
Outstanding at July 31, 2020, Weighted Average Grant Date Fair Value \| $ / shares	$ 50.61
Performance-Based RSUs, Grants in Period \| shares	64,634
Performance-Based RSUs, Grants in Period, Weighted Average Grant Date Fair Value \| $ / shares	$ 60.73
Performance-Based RSUs, Vested in Period \| shares	(71,413)
Performance-Based RSUs, Vested in Period, Weighted Average Grant Date Fair Value \| $ / shares	$ 33.12
Performance-Based RSUs, Forfeited in Period \| shares	0
Performance-Based RSUs, Forfeitures, Weighted Average Grant Date Fair Value \| $ / shares	$ 0
Outstanding at October 31, 2020 \| shares	119,281
Outstanding at October 31, 2020, Weighted Average Grant Date Fair Value \| $ / shares	$ 61.05

The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iv)(3)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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- Definition

Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)(3)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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- Definition

The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)(1)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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- Definition

The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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- Definition

The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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- Definition

Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(i)-(ii)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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- Definition

The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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