v3.26.1
Nature of Operations and Summary of Siginificant Accounting Policies (Details)
$ / shares in Units, $ in Thousands
 12 Months Ended
Mar. 31, 2026
USD ($)
segment
$ / shares
Mar. 31, 2025
USD ($)
segment
$ / shares
Mar. 31, 2024
USD ($)
$ / shares
Loss Contingencies [Line Items]      
Number of Reportable Segments | segment 3 4  
Deferred Revenue, Revenue Recognized $ 51,500 $ 65,100  
Interest Costs, Capitalized During Period 12,000 7,200  
Interest Costs Incurred 60,700 86,300 $ 144,400
Interest Paid, Including Capitalized Interest, Operating and Investing Activities 64,700 89,400 142,200
Advertising Expense 20,300 19,900 25,500
Revenue, Remaining Performance Obligation, Amount 1,366,200    
Cost of revenues 3,309,400 3,056,800 2,920,500
Gross Profit 2,626,500 2,402,800 2,218,200
Operating Income (Loss) 1,101,800 866,600 836,100
Income Tax Expense (Benefit) 262,200 184,700 149,500
Income from continuing operations, net of income tax 785,100 616,100 380,100
Net Income (Loss) Attributable to Parent $ 782,300 $ 614,600 $ 378,200
Earnings Per Share, Basic | $ / shares $ 7.97 $ 6.24 $ 3.83
Earnings Per Share, Diluted | $ / shares $ 7.93 $ 6.20 $ 3.81
Comprehensive Income (Loss), Net of Tax, Attributable to Parent $ 961,500 $ 651,000 $ 370,300
Inventory, Net 631,800 581,300  
Retained earnings 3,015,900 2,475,300  
Increase (Decrease) in Inventories 24,000 (73,100) 37,500
Accruals and other, net 47,800 38,900 40,000
Deferred income taxes (16,900) (76,500) (131,400)
Product      
Loss Contingencies [Line Items]      
Cost of revenues $ 1,625,500 $ 1,514,300 $ 1,516,100
Property, Plant and Equipment, Other Types [Member]      
Loss Contingencies [Line Items]      
Property, Plant, and Equipment, Useful Life 20 years    
Minimum [Member]      
Loss Contingencies [Line Items]      
Finite-Lived Intangible Assets, Useful Life, Minimum 5 years    
Minimum [Member] | Land Improvements [Member]      
Loss Contingencies [Line Items]      
Property, Plant, and Equipment, Useful Life 3 years    
Minimum [Member] | Building [Member]      
Loss Contingencies [Line Items]      
Property, Plant, and Equipment, Useful Life 2 years    
Minimum [Member] | Machinery and Equipment [Member]      
Loss Contingencies [Line Items]      
Property, Plant, and Equipment, Useful Life 2 years    
Minimum [Member] | Computer Equipment [Member]      
Loss Contingencies [Line Items]      
Property, Plant, and Equipment, Useful Life 2 years    
Maximum [Member]      
Loss Contingencies [Line Items]      
Finite-Lived Intangible Assets, Useful Life, Minimum 20 years    
Maximum [Member] | Land Improvements [Member]      
Loss Contingencies [Line Items]      
Property, Plant, and Equipment, Useful Life 40 years    
Maximum [Member] | Building [Member]      
Loss Contingencies [Line Items]      
Property, Plant, and Equipment, Useful Life 50 years    
Maximum [Member] | Machinery and Equipment [Member]      
Loss Contingencies [Line Items]      
Property, Plant, and Equipment, Useful Life 20 years    
Maximum [Member] | Computer Equipment [Member]      
Loss Contingencies [Line Items]      
Property, Plant, and Equipment, Useful Life 20 years    
Expected recognition within the next year [Member]      
Loss Contingencies [Line Items]      
Revenue, Remaining Performance Obligation, Percentage 56.00%    
Expected recognition beyond the next year [Member] [Member]      
Loss Contingencies [Line Items]      
Revenue, Remaining Performance Obligation, Percentage 35.00%