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Industry Segment and Geographic Area Data (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Mar. 31, 2015
Quarter ended: |  |  |
Total revenues | $ 884,805 | $ 818,955 |
Depreciation and amortization, net of (gains) losses on disposals | 55,760 | 65,235 |
Interest expense | 22,100 | 24,148 |
Pretax earnings (loss) | 269,008 | 195,051 |
Income tax expense | 97,723 | 70,577 |
Identifiable assets | 7,090,634 | 6,528,682 | $ 6,872,175
United States [Member] |  |  |
Quarter ended: |  |  |
Total revenues | 841,463 | 773,043 |
Depreciation and amortization, net of (gains) losses on disposals | 56,739 | 64,040 |
Interest expense | 21,989 | 24,019 |
Pretax earnings (loss) | 259,127 | 186,907 |
Income tax expense | 95,095 | 68,419 |
Identifiable assets | 6,874,093 | 6,358,303 |
Canada [Member] |  |  |
Quarter ended: |  |  |
Total revenues | 43,342 | 45,912 |
Depreciation and amortization, net of (gains) losses on disposals | (979) | 1,195 |
Interest expense | 111 | 129 |
Pretax earnings (loss) | 9,881 | 8,144 |
Income tax expense | 2,628 | 2,158 |
Identifiable assets | $ 216,541 | $ 170,379 |

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- Definition Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.18) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 12 -Article 7 + Details
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