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Earnings Per Share (Details)
 1 Months Ended 3 Months Ended 13 Months Ended
Jun. 07, 2018
Mar. 31, 2020
USD ($)
shares
Mar. 31, 2021
USD ($)
$ / shares
shares
Mar. 31, 2020
USD ($)
$ / shares
shares
Jun. 30, 2020
USD ($)
shares
Sep. 30, 2020
USD ($)
Jun. 06, 2018
USD ($)
Antidilutive Securities Excluded from Computation of Earnings Per Share              
Share repurchase program, authorized amount | $           $ 50,000,000.0  
Common stock repurchased and recorded as treasury stock (in shares) | shares   2,716,034 0   12,661,581    
Repurchase of treasury stock | $   $ 36,200,000   $ 36,180,000 $ 200,000,000.0    
Net Income (Numerator)              
Basic EPS - common stock | $     $ 43,687,000 25,953,000      
Diluted EPS - common stock | $     $ 43,687,000 $ 25,953,000      
Weighted-Average Shares (Denominator)              
Basic EPS - common stock (in shares) | shares     123,324,745 124,295,327      
Effect of dilutive securities:              
Stock options, restricted stock, and ESPP shares (in shares) | shares     1,011,385 380,969      
Diluted EPS - common stock (shares) | shares     124,336,130 124,676,296      
Earnings Per Share              
Basic EPS - common stock (in dollars per share) | $ / shares     $ 0.35 $ 0.21      
Diluted EPS - common stock (in dollars per share) | $ / shares     $ 0.35 $ 0.21      
Convertible Notes              
Antidilutive Securities Excluded from Computation of Earnings Per Share              
Aggregate principal amount issued | $     $ 217,500,000       $ 217,500,000
Initial conversion rate 0.0450760   0.0450760        
Stock options and restricted share awards              
Antidilutive Securities Excluded from Computation of Earnings Per Share              
Antidilutive shares of common stock | shares     594,053 660,995