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Industry Segment and Geographic Area Data (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Mar. 31, 2013 | Mar. 31, 2012 | Mar. 31, 2011
Fiscal year ended: |  |  |
Total revenues | $ 2,558,587 | $ 2,512,027 | $ 2,251,359
Depreciation and amortization, net of (gains) losses on disposals | 255,372 | 222,692 | 198,760
Interest expense | 90,696 | 90,371 | 88,381
Pretax earnings | 408,487 | 325,636 | 289,314
Income tax expense | 143,779 | 120,269 | 105,739
Identifiable assets | 5,306,601 | 4,654,051 | 4,191,433
United States |  |  |
Fiscal year ended: |  |  |
Total revenues | 2,409,291 | 2,364,560 | 2,120,597
Depreciation and amortization, net of (gains) losses on disposals | 247,413 | 214,800 | 192,328
Interest expense | 90,137 | 89,730 | 87,717
Pretax earnings | 389,342 | 302,748 | 270,695
Income tax expense | 138,911 | 114,050 | 100,212
Identifiable assets | 5,160,889 | 4,518,772 | 4,061,648
Canada |  |  |
Fiscal year ended: |  |  |
Total revenues | 149,296 | 147,467 | 130,762
Depreciation and amortization, net of (gains) losses on disposals | 7,959 | 7,892 | 6,432
Interest expense | 559 | 641 | 664
Pretax earnings | 19,145 | 22,888 | 18,619
Income tax expense | 4,868 | 6,219 | 5,527
Identifiable assets | $ 145,712 | $ 135,279 | $ 129,785

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