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Share Based Compensation Arrangement by Share Based Payment Award, Equity Instruments Other than Options, Vested in Period, Total Fair Value2

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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.

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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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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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STOCKHOLDERS' EQUITY AND STOCK-BASED COMPENSATION - Performance-based Restricted Stock Units, Narrative (Details) $ in Millions		12 Months Ended
	Dec. 31, 2023 shares	Mar. 31, 2024 USD ($) plan shares	Mar. 31, 2023 USD ($) plan shares	Mar. 31, 2022 USD ($) plan shares
Share-based compensation
Number of performance plans \| plan		2	2	3
Performance Based Stock Units
Share-based compensation
Granted (in shares)			406,501
Aggregate fair value of restricted stock units granted \| $			$ 10.0
Restricted stock units \| Operating Metrics Performance Plan
Share-based compensation
Granted (in shares)				58,312
Award vesting rights percentage		59.00%
Forfeited in period (in shares)		39,211
Vesting in period (in shares)		67,283
Outstanding at the end of the period (in shares)		8,971
Restricted stock units \| Performance stock
Share-based compensation
Granted (in shares)		666,496		249,152
Aggregate fair value of restricted stock units granted \| $		$ 21.0		$ 12.6
Forfeited in period (in shares)		223,223
Vesting in period (in shares)		57,114
Outstanding at the end of the period (in shares)		1,095,748	709,589
The total fair value of performance-based restricted stock units \| $		$ 1.5	$ 3.0	$ 6.7
Restricted stock units \| Performance stock \| Operating Metrics Performance Plan
Share-based compensation
Granted (in shares)		466,550		148,912
Aggregate fair value of restricted stock units granted \| $		$ 12.6		$ 7.1
Restricted stock units \| Performance stock \| Minimum \| Operating Metrics Performance Plan
Share-based compensation
Award vesting rights percentage				0.00%
Restricted stock units \| Performance stock \| Maximum \| Operating Metrics Performance Plan
Share-based compensation
Award vesting rights percentage				200.00%
Restricted stock units \| Performance-Based Restricted Stock Units Under The Total Shareholder Return Performance Plan
Share-based compensation
Granted (in shares)		199,946
Aggregate fair value of restricted stock units granted \| $		$ 8.4
Restricted stock units \| Performance Based Stock Units
Share-based compensation
Granted (in shares)		101,931	121,951
Aggregate fair value of restricted stock units granted \| $			$ 3.7
Restricted stock units \| Performance Based Stock Units Under Operating Metrics
Share-based compensation
Granted (in shares)		237,837	284,550
Aggregate fair value of restricted stock units granted \| $			$ 6.3
Restricted stock units \| Performance Based Stock Units Under Operating Metrics \| Minimum
Share-based compensation
Award vesting rights percentage			0.00%
Restricted stock units \| Performance Based Stock Units Under Operating Metrics \| Maximum
Share-based compensation
Award vesting rights percentage			200.00%
Restricted stock units \| ATS Performance Plan Vesting Total Shareholder Return
Share-based compensation
Granted (in shares)				36,425
Aggregate fair value of restricted stock units granted \| $				$ 1.7
Restricted stock units \| ATS Performance Plan Vesting Total Shareholder Return \| Minimum
Share-based compensation
Award vesting rights percentage				0.00%
Restricted stock units \| ATS Performance Plan Vesting Total Shareholder Return \| Maximum
Share-based compensation
Award vesting rights percentage				100.00%
Restricted stock units \| 2022 Performance Shares That Will Vest Immediately
Share-based compensation
Award vesting rights percentage	77.00%
Forfeited in period (in shares)	27,959
Restricted stock units \| Performance Shares Vesting Total Shareholder Return
Share-based compensation
Granted (in shares)				63,815
Aggregate fair value of restricted stock units granted \| $				$ 3.8
Restricted stock units \| Performance Shares Vesting Total Shareholder Return \| Minimum
Share-based compensation
Award vesting rights percentage		0.00%		0.00%
Restricted stock units \| Performance Shares Vesting Total Shareholder Return \| Minimum \| Operating Metrics Performance Plan
Share-based compensation
Award vesting rights percentage		0.00%
Restricted stock units \| Performance Shares Vesting Total Shareholder Return \| Maximum
Share-based compensation
Award vesting rights percentage		200.00%		200.00%
Restricted stock units \| Performance Shares Vesting Total Shareholder Return \| Maximum \| Operating Metrics Performance Plan
Share-based compensation
Award vesting rights percentage		200.00%
Restricted stock units \| 2021 Performance Shares That Will Vest In One Year
Share-based compensation
Granted (in shares)				20,968
Award vesting rights percentage				51.00%
Forfeited in period (in shares)				20,330