Amounts Receivable and Prepaids (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
Jun. 30, 2026	Mar. 31, 2026	Mar. 31, 2025	Mar. 31, 2024
Receivables [Abstract]
Provision for uncertainty of collection		$ 300		$ 4,500
Provisions on sales tax payable			$ 2,300
Recovery of provision	$ 0	2,467	$ 1,300
Sales tax credits received		$ 2,300

Amount of expense related to credit loss from transactions other than loan and lease transactions.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 45
-Paragraph 28
-Subparagraph (a)
-SubTopic 10
-Topic 230
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-28

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 942
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04(11))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478524/942-220-S99-1

Name:	us-gaap_ProvisionForOtherCreditLosses
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration