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Intrinsic value of granted award under share-based payment arrangement. Excludes share and unit options.

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No definition available.

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Fair value of non-vested equity-based payment instruments, excluding stock (or unit) options, vested.

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Represents expected volatility rate period for share based payment award by share based payment.

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Represents historical volatility for fair value assumptions for share-based payment award by share based compensation.

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Percent of shares that may be issued in accordance with the plan as a proportion of outstanding awards.

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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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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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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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- Definition

The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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The risk-free interest rate assumption that is used in valuing an option on its own shares.

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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.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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- Definition

Intrinsic value of vested award under share-based payment arrangement. Excludes share and unit options.

+ References

No definition available.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Stock-based compensation - Narrative (Details)					3 Months Ended		9 Months Ended		12 Months Ended
Stock-based compensation - Narrative (Details)	Mar. 31, 2023 shares	Jan. 08, 2023 USD ($) peer shares	Feb. 24, 2022 USD ($) peer shares	Feb. 08, 2021 USD ($) shares	Sep. 30, 2023 USD ($) shares	Sep. 30, 2022 USD ($)	Sep. 30, 2023 USD ($) shares	Sep. 30, 2022 USD ($)	Dec. 31, 2022 peer
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Share-based payment arrangement, expense					$ 9,117,000	$ 6,299,000	$ 23,337,000	$ 17,671,000
Number of peers \| peer		20	20						20
Share-based compensation arrangement by share-based payment award, vesting period							4 years
Options
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, options, outstanding, intrinsic value					3,300,000		$ 3,300,000
Share-based compensation arrangement by share-based payment award, options, exercises in period, intrinsic value					$ 500,000		$ 3,300,000
Share-based compensation arrangement by share-based payment award, options, grants in period, gross (in shares) \| shares					0		0
Share-based compensation arrangement by share-based payment award, options, outstanding, weighted average remaining contractual term							2 years 3 months 18 days
Share-based payment arrangement, nonvested award, cost not yet recognized, amount					$ 0		$ 0
Restricted Stock
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Share-based payment arrangement, nonvested award, cost not yet recognized, amount					33,000,000		33,000,000
Share-based compensation arrangement by share-based payment award, equity instruments other than options, grants in period, fair value					1,000,000		16,800,000
Share-based compensation arrangement by share-based payment award, equity instruments other than options, vested in period, fair value					5,000,000		16,900,000
Share-based payment arrangement, expense					9,100,000		$ 23,300,000
Share-based payment arrangement, nonvested award, cost not yet recognized, period for recognition							2 years 2 months 12 days
Granted (in shares) \| shares							584,976
Market-based Restricted Stock
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Share-based payment arrangement, nonvested award, cost not yet recognized, amount					4,900,000		$ 4,900,000
Share-based compensation arrangement by share-based payment award, equity instruments other than options, grants in period, fair value				$ 1,300,000
Share-based payment arrangement, expense					$ 1,600,000	1,200,000	$ 4,900,000	3,100,000
Share-based payment arrangement, nonvested award, cost not yet recognized, period for recognition							1 year 1 month 6 days
Granted (in shares) \| shares					268,738
Share-based compensation arrangement by share-based payment award, percentage of awards	100.00%
Share-based compensation arrangement by share-based payment award, fair value assumptions, historical volatility rate		78.00%	63.00%	68.00%
Share-based compensation arrangement by share-based payment award, fair value assumptions, expected dividend rate		0.00%	0.00%	0.00%
Share-based compensation arrangement by share-based payment award, fair value assumptions, risk free interest rate		4.40%	1.50%	0.10%
Share-based compensation arrangement by Share-based payment award, fair value assumptions, expected volatility rate period		2 years	2 years	2 years
Share-based compensation arrangement by share-based payment award, equity instruments other than options, grants in period, aggregate fair value					$ 0	$ 0	$ 6,500,000	6,700,000
Share-based compensation arrangement by share-based payment award, equity instruments other than options, aggregate intrinsic value, vested							$ 700,000	$ 5,000,000
Market-based Restricted Stock \| Minimum
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, percentage of awards		0.00%	0.00%
Market-based Restricted Stock \| Maximum
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, percentage of awards		200.00%	200.00%
Market-based Restricted Stock \| Executive Officer
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Share-based payment arrangement, expense		$ 6,800,000	$ 6,700,000
Granted (in shares) \| shares	30,616	268,738	240,428	30,616