Industry Segment and Geographic Area Data	9 Months Ended
	Dec. 31, 2022
Segments, Geographical Areas [Abstract]
12. Industry Segment and Geographic Area Data	12. Industry Segment and Geographic Area Data     United States   Canada   Consolidated     (Unaudited)     (All amounts are in thousands of U.S. $'s) Quarter Ended December 31, 2022             Total revenues $ 1,311,117 $ 64,219 $ 1,375,336 Depreciation and amortization, net of (gains) on disposal   119,864   1,840   121,704 Interest expense   58,367   674   59,041 Pretax earnings   253,778   7,230   261,008 Income tax expense   59,774   1,990   61,764 Identifiable assets   17,473,785   642,543   18,116,328               Quarter Ended December 31, 2021             Total revenues $ 1,334,131 $ 70,205 $ 1,404,336 Depreciation and amortization, net of (gains) on disposal   110,383   2,277   112,660 Interest expense   43,140   902   44,042 Pretax earnings   360,449   10,997   371,446 Income tax expense   87,135   2,845   89,980 Identifiable assets   16,077,571   510,507   16,588,078       United States   Canada   Consolidated     (Unaudited)     (All amounts are in thousands of U.S. $'s) Nine Months Ended December 31, 2022             Total revenues $ 4,431,570 $ 244,470 $ 4,676,040 Depreciation and amortization, net of (gains) on disposal   365,585   6,056   371,641 Interest expense   163,792   2,241   166,033 Pretax earnings   1,127,685   38,018   1,165,703 Income tax expense   270,641   9,801   280,442 Identifiable assets   17,473,785   642,543   18,116,328               Nine Months Ended December 31, 2021             Total revenues $ 4,307,322 $ 234,124 $ 4,541,446 Depreciation and amortization, net of (gains) on disposal   379,989   1,802   381,791 Interest expense   119,856   2,909   122,765 Pretax earnings   1,320,056   45,016   1,365,072 Income tax expense   317,057   11,476   328,533 Identifiable assets   16,077,571   510,507   16,588,078