v3.26.1
Accumulated Other Comprehensive Loss - Changes in Accumulated Other Comprehensive Income by Component (Details) - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Mar. 31, 2024
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance $ 882,095    
Other comprehensive income (loss) before reclassification 13,793 $ 8,360  
Amounts reclassified from other comprehensive loss to net income 560 10,216  
Total other comprehensive income (loss) 14,353 18,576 $ (1,634)
Ending balance 1,448,727 882,095  
Accumulated Other  Comprehensive  Loss      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance (21,101) (39,677)  
Ending balance (6,748) (21,101) (39,677)
Retirement Obligations      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance 14,760 (10,696)  
Other comprehensive income (loss) before reclassification 2,605 7,274  
Amounts reclassified from other comprehensive loss to net income (894) 18,182  
Total other comprehensive income (loss) 1,711 25,456  
Ending balance 16,471 14,760 (10,696)
Foreign Currency      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance (33,942) (32,785)  
Other comprehensive income (loss) before reclassification 12,343 (1,157)  
Amounts reclassified from other comprehensive loss to net income 0 0  
Total other comprehensive income (loss) 12,343 (1,157)  
Ending balance (21,599) (33,942) (32,785)
Change in Derivatives Qualifying as Hedges      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance (1,919) 3,804  
Other comprehensive income (loss) before reclassification (1,155) 2,243  
Amounts reclassified from other comprehensive loss to net income 1,454 (7,966)  
Total other comprehensive income (loss) 299 (5,723)  
Ending balance $ (1,620) $ (1,919) $ 3,804