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Financial Information by Geographic Area (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Mar. 31, 2016 | Mar. 31, 2015 | Mar. 31, 2014
Fiscal year ended: |  |  |
Total revenues | $ 3,275,656 | $ 3,074,531 | $ 2,835,252
Depreciation and amortization, net of (gains) losses on disposals | 313,962 | 297,826 | 279,594
Interest expense | 97,903 | 97,525 | 92,692
Pretax earnings | 768,911 | 561,418 | 537,522
Income tax expense | 279,910 | 204,677 | 195,131
Identifiable assets | 8,150,725 | 6,872,175 | 5,998,978
United States [Member] |  |  |
Fiscal year ended: |  |  |
Total revenues | 3,130,097 | 2,916,027 | 2,681,800
Depreciation and amortization, net of (gains) losses on disposals | 313,099 | 292,345 | 272,236
Interest expense | 97,739 | 96,979 | 92,128
Pretax earnings | 745,194 | 541,371 | 516,207
Income tax expense | 273,473 | 199,444 | 189,419
Identifiable assets | 7,901,365 | 6,685,572 | 5,854,503
Canada [Member] |  |  |
Fiscal year ended: |  |  |
Total revenues | 145,559 | 158,504 | 153,452
Depreciation and amortization, net of (gains) losses on disposals | 863 | 5,481 | 7,358
Interest expense | 164 | 546 | 564
Pretax earnings | 23,717 | 20,047 | 21,315
Income tax expense | 6,437 | 5,233 | 5,712
Identifiable assets | $ 249,360 | $ 186,603 | $ 144,475

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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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- Definition Sum of operating profit and nonoperating income or expense before Income or Loss from equity method investments, income taxes, extraordinary items, and noncontrolling interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(1)(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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