Equity - Unvested RSA & RSU Rollforward (Details) - $ / shares	3 Months Ended
Oct. 31, 2021	Jul. 31, 2021	Apr. 30, 2021
RSA \| Out of the Plans
Number of Shares
Unvested balance, beginning (shares)	561,085	651,499	741,911
Vested (shares)	(90,412)	(90,414)	(90,412)
Unvested balance, ending (shares)	470,673	561,085	651,499
Weighted-Average Grant Date Fair Value per Share
Unvested balance , beginning balance (per share)	$ 2.11	$ 2.11	$ 2.11
Vested (per share)	2.10	2.10	2.10
Unvested balance , ending balance (per share)	$ 2.11	$ 2.11	$ 2.11
RSUs
Number of Shares
Unvested balance, beginning (shares)	10,763,236	11,117,993	9,348,557
Granted (shares)	561,159	584,752	2,413,881
Vested (shares)	(980,901)	(820,002)	(531,845)
Forfeited (shares)	(227,541)	(119,507)	(112,600)
Unvested balance, ending (shares)	10,115,953	10,763,236	11,117,993
Weighted-Average Grant Date Fair Value per Share
Unvested balance , beginning balance (per share)	$ 160.83	$ 150.50	$ 125.06
Granted (per share)	305.15	244.05	223.93
Vested (per share)	99.49	78.84	40.02
Forfeited (per share)	180.53	169.75	134.52
Unvested balance , ending balance (per share)	$ 174.34	$ 160.83	$ 150.50

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

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
-Paragraph 2
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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.

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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).

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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

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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

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

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

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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.

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