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Industry Segment and Geographic Area Data (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended |
--- | --- | ---
Jun. 30, 2012 | Jun. 30, 2011 | Mar. 31, 2012
Quarter ended: |  |  |
Total revenues | $ 665,416 | $ 642,965 |
Depreciation and amortization, net of (gains) losses on disposals | 58,936 | 48,733 |
Interest expense | 23,491 | 22,633 |
Pretax earnings | 127,388 | 125,730 |
Income tax expense | 46,819 | 47,507 |
Identifiable assets | 4,838,836 | 4,174,456 | 4,654,051
United States |  |  |
Quarter ended: |  |  |
Total revenues | 623,923 | 601,091 |
Depreciation and amortization, net of (gains) losses on disposals | 56,963 | 46,864 |
Interest expense | 23,339 | 22,470 |
Pretax earnings | 119,384 | 118,357 |
Income tax expense | 44,698 | 45,329 |
Identifiable assets | 4,690,153 | 4,026,330 |
Canada |  |  |
Quarter ended: |  |  |
Total revenues | 41,493 | 41,874 |
Depreciation and amortization, net of (gains) losses on disposals | 1,973 | 1,869 |
Interest expense | 152 | 163 |
Pretax earnings | 8,004 | 7,373 |
Income tax expense | 2,121 | 2,178 |
Identifiable assets | $ 148,683 | $ 148,126 |

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