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v3.23.2

Stock-based compensation - Summary of Additional Information PSUs Awarded (Parenthetical) (Details) - Performance Shares [Member] | Mar. 31, 2023
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Maximum [Member] |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |
Payout range | 200.00%
Minimum [Member] |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |
Payout range | 0.00%

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- Definition Payout range. + References No definition available. + Details
Name: | nxt_PayoutRange
Namespace Prefix: | nxt_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition 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. + References No definition available. + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_AwardTypeAxis=us-gaap_PerformanceSharesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |