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Industry Segment and Geographic Area Data (Table Text Block) | 6 Months Ended
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Sep. 30, 2012
Geographic Areas, Long-Lived Assets [Abstract] |
Industry segment and geographic area data |
|  | United States |  |  | Canada |  |  | Consolidated |
|  | (Unaudited) |
|  | (All amounts are in thousands of U.S. $'s) |
Quarter ended September 30, 2012 |  |  |  |  |  |  |  |  |
Total revenues |  | $ | 692,822 |  |  | $ | 48,495 |  |  | $ | 741,317 |
Depreciation and amortization, net of (gains) losses on disposals |  |  | 59,972 |  |  |  | 2,070 |  |  |  | 62,042 |
Interest expense |  |  | 21,961 |  |  |  | 152 |  |  |  | 22,113 |
Pretax earnings |  |  | 162,693 |  |  |  | 9,516 |  |  |  | 172,209 |
Income tax expense |  |  | 60,267 |  |  |  | 2,522 |  |  |  | 62,789 |
Identifiable assets |  |  | 4,984,218 |  |  |  | 152,746 |  |  |  | 5,136,964 |
Quarter ended September 30, 2011 |  |  |  |  |  |  |  |  |  |  |  |
Total revenues |  | $ | 656,095 |  |  | $ | 47,086 |  |  | $ | 703,181 |
Depreciation and amortization, net of (gains) losses on disposals |  |  | 48,689 |  |  |  | 2,050 |  |  |  | 50,739 |
Interest expense |  |  | 22,802 |  |  |  | 161 |  |  |  | 22,963 |
Pretax earnings |  |  | 152,021 |  |  |  | 9,449 |  |  |  | 161,470 |
Income tax expense |  |  | 57,681 |  |  |  | 2,778 |  |  |  | 60,459 |
Identifiable assets |  |  | 4,269,467 |  |  |  | 133,670 |  |  |  | 4,403,137 |
|  | United States |  |  | Canada |  |  | Consolidated |
|  | (Unaudited) |
|  | (All amounts are in thousands of U.S. $'s) |
Six months ended September 30, 2012 |  |  |  |  |  |  |  |  |
Total revenues |  | $ | 1,316,745 |  |  | $ | 89,988 |  |  | $ | 1,406,733 |
Depreciation and amortization, net of (gains) losses on disposals |  |  | 116,935 |  |  |  | 4,043 |  |  |  | 120,978 |
Interest expense |  |  | 45,300 |  |  |  | 304 |  |  |  | 45,604 |
Pretax earnings |  |  | 282,077 |  |  |  | 17,520 |  |  |  | 299,597 |
Income tax expense |  |  | 104,965 |  |  |  | 4,643 |  |  |  | 109,608 |
Identifiable assets |  |  | 4,984,218 |  |  |  | 152,746 |  |  |  | 5,136,964 |
Six months ended September 30, 2011 |  |  |  |  |  |  |  |  |  |  |  |
Total revenues |  | $ | 1,257,186 |  |  | $ | 88,960 |  |  | $ | 1,346,146 |
Depreciation and amortization, net of (gains) losses on disposals |  |  | 95,553 |  |  |  | 3,919 |  |  |  | 99,472 |
Interest expense |  |  | 45,272 |  |  |  | 324 |  |  |  | 45,596 |
Pretax earnings |  |  | 270,378 |  |  |  | 16,822 |  |  |  | 287,200 |
Income tax expense |  |  | 103,010 |  |  |  | 4,956 |  |  |  | 107,966 |
Identifiable assets |  |  | 4,269,467 |  |  |  | 133,670 |  |  |  | 4,403,137 |

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