Annual report pursuant to Section 13 and 15(d)

Stock-Based Compensation Expense - Restricted Shares (Details)

v3.20.1
Stock-Based Compensation Expense - Restricted Shares (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Issuance of restricted stock as deferred compensation to employees and directors   20,064  
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period, Value   $ 454  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]      
Exercised (in shares)     (88,084)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]      
Exercised, weighted average exercise price (in dollars per share)     $ 21.51
Restricted Stock Units (RSUs)      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Aggregate intrinsic value $ 3,567    
Total unrecognized expense related to non-vested stock option awards $ 3,208    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]      
Outstanding, beginning of period (in shares) 237,025 229,112 208,146
Granted (in shares) 122,747 115,378 119,302
Exercised (in shares) (117,216) (101,874)  
Forfeited (in shares) (5,850) (5,591) (10,252)
Outstanding, end of period (in shares) 236,706 237,025 229,112
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]      
Options outstanding, weighted average grant price, beginning of period (in dollars per share) $ 21.26 $ 19.55 $ 20.64
Granted, weighted average exercise price (in dollars per share) 22.17 23.44 19.16
Exercised, weighted average exercise price (in dollars per share) 20.39 19.93  
Forfeited, weighted average exercise price (in dollars per share) 21.81 19.98 20.05
Options outstanding, weighted average grant price, end of period (in dollars per share) $ 22.14 $ 21.26 $ 19.55
Stock based compensation, recognition period 1 year 6 months 7 days    
Performance Shares      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Grants in period (shares) 92,394,000 68,178,000 73,684,000
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period, Value $ 2,285 $ 1,654 $ 1,420
Total unrecognized expense related to non-vested stock option awards $ 2,101    
Vested shares 79,144,000 36,611,000 0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]      
Stock based compensation, recognition period 2 years 29 days    
Restricted Stock      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number 0    
Minimum | Performance Shares      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement By Share-based Payment Award, Percentage Of Target Shares 0.00%    
Share Based Compensation Arrangement, Possible Number Of Shares Issued Each Year 0 0 0
Maximum | Performance Shares      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement By Share-based Payment Award, Percentage Of Target Shares 200.00%    
Share Based Compensation Arrangement, Possible Number Of Shares Issued Each Year 184,788,000 131,050,000 147,368,000
Common Stock      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Issuance of restricted stock as deferred compensation to employees and directors 26,608    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]      
Exercised (in shares) (159,062) (37,906) (42,636)