Annual report pursuant to Section 13 and 15(d)

Stock Compensation Plans - Schedule of Restricted Stock Units ("RSUs"), Performance Stock Units ("PSUs"), and Restricted Stock Awards ("RSAs") Granted (Detail)

v3.23.1
Stock Compensation Plans - Schedule of Restricted Stock Units ("RSUs"), Performance Stock Units ("PSUs"), and Restricted Stock Awards ("RSAs") Granted (Detail) - shares
shares in Thousands
 12 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Mar. 31, 2021
Performance Vested Restricted Stock [Member]      
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]      
Total Shares Awarded   88 54
Performance Vested Restricted Stock [Member] | Director [Member]      
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]      
Restricted stock awarded [1]   0 0
Performance Vested Restricted Stock [Member] | Officers and Key Employees [Member]      
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]      
Restricted stock awarded [1]   88 54
Time Vested Restricted Stock [Member]      
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]      
Total Shares Awarded   76 59
Time Vested Restricted Stock [Member] | Director [Member]      
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]      
Restricted stock awarded [1]   22 21
Time Vested Restricted Stock [Member] | Officers and Key Employees [Member]      
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]      
Restricted stock awarded [1]   0 0
Time Vested Restricted Stock Units (RSUs) [Member]      
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]      
Total Shares Awarded 126    
Time Vested Restricted Stock Units (RSUs) [Member] | Director [Member]      
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]      
Restricted stock awarded [1] 37    
Time Vested Restricted Stock Units (RSUs) [Member] | Officers and Key Employees [Member]      
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]      
Restricted stock awarded [1] 33    
Performance Vested Performance Stock Units (PSU) [Member]      
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]      
Total Shares Awarded 112    
Performance Vested Performance Stock Units (PSU) [Member] | Director [Member]      
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]      
Restricted stock awarded [1] 0    
Performance Vested Performance Stock Units (PSU) [Member] | Officers and Key Employees [Member]      
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]      
Restricted stock awarded [1] 112    
Time Vest One-Third Per Year [Member] | Officers and Key Employees [Member]      
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]      
Restricted stock awarded [1] 56 54 38
Performance Vest One-Third Per Year [Member] | Officers and Key Employees [Member]      
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]      
Restricted stock awarded [1] 0 0 0
[1] Subject to the terms of the applicable award.