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Leases | 9 Months Ended
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Dec. 31, 2024
Leases |
Leases | Note 16: Leases Lease assets and liabilities The following table provides a summary of leases recorded on the consolidated balance sheets. ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Balance Sheet Location |  | December 31, 2024 |  | March 31, 2024
Lease Assets |  |  |  | ​ |  |  | ​ |
Operating lease ROU assets |  | Other noncurrent assets | ​ | $ | 96.4 | ​ | $ | 76.0
Finance lease ROU assets (a) |  | Property, plant and equipment - net | ​ |  | 6.8 | ​ |  | 6.5
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Lease Liabilities |  |  | ​ |  | ​ | ​ |  |
Operating lease liabilities |  | Other current liabilities | ​ | $ | 19.7 | ​ | $ | 15.3
Operating lease liabilities |  | Other noncurrent liabilities | ​ |  | 78.5 | ​ |  | 62.1
Finance lease liabilities |  | Long-term debt - current portion | ​ |  | 0.5 | ​ |  | 0.4
Finance lease liabilities |  | Long-term debt | ​ |  | 2.2 | ​ |  | 1.9
____ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
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(a) | Finance right of use (“ROU”) assets were recorded net of accumulated amortization of $4.0 million and $3.7 million as of December 31, 2024 and March 31, 2024, respectively.
The increases in operating lease ROU assets and liabilities from March 31, 2024 to December 31, 2024 primarily resulted from the commencement of new facility leases. The Company is increasing its production capacity to support organic growth opportunities, including within its Data Center Cooling business. Components of lease expense The components of lease expense were as follows: ​
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​ | ​ | Three months ended December 31, | ​ | Nine months ended December 31,
​ |  | 2024 |  | 2023 |  | 2024 |  | 2023
Operating lease expense (a) | ​ | $ | 8.5 | ​ | $ | 6.1 | ​ | $ | 23.1 | ​ | $ | 17.6
Finance lease expense: | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Depreciation of ROU assets | ​ |  | 0.1 | ​ |  | 0.1 | ​ |  | 0.4 | ​ |  | 0.4
Interest on lease liabilities | ​ |  | — | ​ |  | — | ​ |  | 0.1 | ​ |  | 0.1
Total lease expense | ​ | $ | 8.6 | ​ | $ | 6.2 | ​ | $ | 23.6 | ​ | $ | 18.1
____ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
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(a) | For the three and nine months ended December 31, 2024, operating lease expense included short-term lease expense of $1.7 million and $4.8 million, respectively. For the three and nine months ended December 31, 2023, operating lease expense included short-term lease expense of $1.4 million and $4.3 million, respectively. Variable lease expense was not significant.

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- Definition The entire disclosure for lessee entity's leasing arrangements including, but not limited to, all of the following: (a.) The basis on which contingent rental payments are determined, (b.) The existence and terms of renewal or purchase options and escalation clauses, (c.) Restrictions imposed by lease agreements, such as those concerning dividends, additional debt, and further leasing. + References No definition available. + Details
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Namespace Prefix: | mod_
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Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_LeasesAbstract
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Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration