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Stockholder's Equity (Details 2) - Stock Options - $ / shares	12 Months Ended
	Jul. 31, 2021	Jul. 31, 2020	Jul. 31, 2019
Number Of Shares [Roll Forward]
Non-vested shares at July 31,	3,303,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross	1,310,000
Vested (in shares)	(1,139,000)
Forfeitures or expirations (in shares)	(213,000)
Non-vested shares at July 31,	3,261,000	3,303,000
Weighted Average Grant Date Fair Value [Roll Forward]
Non-vested shares at July 31, fair value	$ 17.58
Grants of non-vested shares, fair value	30.43	$ 21.54	$ 15.47
Vested, fair value	16.65
Forfeitures or expirations, fair value	12.84
Non-vested shares at July 31, fair value	22.80	$ 17.58
Valuation Technique, Option Pricing Model [Member]
Weighted Average Grant Date Fair Value [Roll Forward]
Grants of non-vested shares, fair value	$ 31.17

X

- Definition

For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired.

+ 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)(1)(iv)(3)-(4)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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- Definition

Gross number of share options (or share units) granted during the period.

+ References

No definition available.

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- Definition

The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

+ 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 (d)(1)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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- Definition

Number of non-vested options outstanding.

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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- Definition

Weighted average grant-date fair value of non-vested options forfeited.

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Weighted average grant-date fair value of non-vested options outstanding.

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Number of options vested.

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