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Industry Segment and Geographic Area Data (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Mar. 31, 2017
Quarter ended:          
Total revenues $ 1,042,686 $ 998,685 $ 2,000,611 $ 1,921,876  
Depreciation and amortization, net of (gains) losses on disposals 138,922 115,893 271,925 219,216  
Interest expense 32,023 27,989 62,368 54,415  
Pretax earnings 197,358 278,991 396,044 512,122  
Income tax expense 72,719 102,516 145,198 188,474  
Identifiable assets 10,082,890 9,007,118 10,082,890 9,007,118 $ 9,405,840
United States [Member]          
Quarter ended:          
Total revenues 988,808 949,915 1,901,922 1,830,644  
Depreciation and amortization, net of (gains) losses on disposals 136,597 114,794 268,096 216,794  
Interest expense 31,268 27,987 60,911 54,413  
Pretax earnings 192,585 270,644 384,558 495,557  
Income tax expense 71,280 100,272 141,890 184,017  
Identifiable assets 9,621,634 8,710,057 9,621,634 8,710,057  
Canada [Member]          
Quarter ended:          
Total revenues 53,878 48,770 98,689 91,232  
Depreciation and amortization, net of (gains) losses on disposals 2,325 1,099 3,829 2,422  
Interest expense 755 2 1,457 2  
Pretax earnings 4,773 8,347 11,486 16,565  
Income tax expense 1,439 2,244 3,308 4,457  
Identifiable assets $ 461,256 $ 297,061 $ 461,256 $ 297,061