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Supplemental cash flow disclosures - Summary Of Represents Supplemental Cash Flow Disclosures (Parenthetical) (Details) $ in Millions | 12 Months Ended
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Mar. 31, 2023 USD ($)
Supplemental Cash Flow Elements [Abstract] |
Insurance recoverable set off | $ 22.3

X
- Definition Insurance recoverable set off. + References No definition available. + Details
Name: | nxt_InsuranceRecoverableSetOff
Namespace Prefix: | nxt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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