Annual and transition report of foreign private issuers pursuant to Section 13 or 15(d)

Commitments and Contingencies (Details)

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Commitments and Contingencies (Details) - claim
 1 Months Ended 12 Months Ended
Aug. 03, 2021
Sep. 30, 2021
Mar. 31, 2017
Mar. 31, 2022
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2018
Loss Contingencies [Line Items]                
Number of pending claims     352 365 360 393 332 336
New Zealand | Subsidiaries | New Zealand Weathertightness                
Loss Contingencies [Line Items]                
Number of claims     4          
Number of pending claims     2          
Appeal hearing date duration   10 days            
Number of claims settled 2