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Geographic Area Data (Summary of Geographic Area Data) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Mar. 31, 2025
Quarter ended:          
Total revenues $ 1,719,922 $ 1,658,108 $ 3,350,392 $ 3,206,598  
Depreciation and amortization, net of (gains) losses on disposals 350,101 234,700 657,410 458,995  
Interest expense 90,305 71,498 172,635 138,716  
Pretax earnings 136,959 246,217 322,340 502,609  
Income tax expense 31,409 59,419 74,459 120,394  
Identifiable assets 21,428,419 20,126,551 21,428,419 20,126,551 $ 20,479,170
United States [Member]          
Quarter ended:          
Total revenues 1,621,719 1,565,478 3,165,061 3,033,171  
Depreciation and amortization, net of (gains) losses on disposals 336,450 226,600 632,863 446,012  
Interest expense 89,450 70,924 171,301 137,673  
Pretax earnings 130,251 236,601 310,343 483,919  
Income tax expense 29,526 56,712 70,879 115,089  
Identifiable assets 20,438,542 19,238,854 20,438,542 19,238,854  
Canada [Member]          
Quarter ended:          
Total revenues 98,203 92,630 185,331 173,427  
Depreciation and amortization, net of (gains) losses on disposals 13,651 8,100 24,547 12,983  
Interest expense 855 574 1,334 1,043  
Pretax earnings 6,708 9,616 11,997 18,690  
Income tax expense 1,883 2,707 3,580 5,305  
Identifiable assets $ 989,877 $ 887,697 $ 989,877 $ 887,697