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Accumulated Other Comprehensive Loss (Details) - USD ($)
9 Months Ended 12 Months Ended
Dec. 31, 2020
Mar. 31, 2020
Sep. 30, 2020
Dec. 31, 2019
Sep. 30, 2019
Mar. 31, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Shareholders' equity $ 1,323,221,000 $ 1,170,971,000 $ 1,278,217,000 $ 1,156,494,000 $ 1,112,790,000 $ 1,095,831,000
Reclassification from accumulated other comprehensive loss into earnings 0 0        
Cumulative translation adjustment            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Shareholders' equity (16,802,000) (39,241,000)        
Unrealized loss on interest rate swaps, net of tax of $752 and $1,453, respectively            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Shareholders' equity (2,517,000) (4,864,000)        
Other comprehensive income (loss), cash flow hedge, reclassification tax 752,000 1,453,000        
Unrecognized net gain (loss) on pension plans, net of tax of $(624) and $17, respectively            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Shareholders' equity 2,088,000 (56,000)        
Accumulated other comprehensive income, accumulated tax (624,000) 17,000        
Accumulated other comprehensive loss, net of tax            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Shareholders' equity $ (17,231,000) $ (44,161,000) $ (28,612,000) $ (26,058,000) $ (29,555,000) $ (25,747,000)