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Industry Segment and Geographic Area Data (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Mar. 31, 2016
Quarter ended: |  |  |  |  |
Total revenues | $ 790,676 | $ 744,751 | $ 2,712,996 | $ 2,592,459 |
Depreciation and amortization, net of (gains) losses on disposals | 121,323 | 90,851 | 340,539 | 215,332 |
Interest expense | 29,003 | 25,407 | 83,862 | 71,480 |
Pretax earnings | 102,700 | 132,495 | 614,822 | 688,598 |
Income tax expense | 37,472 | 50,726 | 225,946 | 252,165 |
Identifiable assets | 9,287,317 | 7,762,534 | 9,287,317 | 7,762,534 | $ 8,127,363
United States [Member] |  |  |  |  |
Quarter ended: |  |  |  |  |
Total revenues | 757,698 | 713,416 | 2,588,786 | 2,470,785 |
Depreciation and amortization, net of (gains) losses on disposals | 119,824 | 90,273 | 336,618 | 215,995 |
Interest expense | 29,000 | 25,357 | 83,857 | 71,319 |
Pretax earnings | 99,660 | 128,799 | 595,217 | 664,189 |
Income tax expense | 36,678 | 49,776 | 220,695 | 245,797 |
Identifiable assets | 8,981,335 | 7,534,725 | 8,981,335 | 7,534,725 |
Canada [Member] |  |  |  |  |
Quarter ended: |  |  |  |  |
Total revenues | 32,978 | 31,335 | 124,210 | 121,674 |
Depreciation and amortization, net of (gains) losses on disposals | 1,499 | 578 | 3,921 | (663) |
Interest expense | 3 | 50 | 5 | 161 |
Pretax earnings | 3,040 | 3,696 | 19,605 | 24,409 |
Income tax expense | 794 | 950 | 5,251 | 6,368 |
Identifiable assets | $ 305,982 | $ 227,809 | $ 305,982 | $ 227,809 |

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- Definition This company-specific concept is a combination of three us-gaap taxonomy concepts. (1) Depreciation: "The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation." (2) Gain (Loss) on Disposition of Assets: "The gains and losses included in earnings resulting from the sale or disposal of tangible assets." (3) Deferred Policy Acquisition Cost Amortization Expense: "Amount of deferred policy acquisition costs charged to expense in the period, generally in proportion to related revenue earned, estimated gross profits, or over the customer relationship or some other period." + References No definition available. + Details
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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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