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Industry Segment and Geographic Area Data (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Mar. 31, 2014 | Mar. 31, 2013 | Mar. 31, 2012
Fiscal year ended: |  |  |
Total revenues | $ 2,835,252 | $ 2,558,587 | $ 2,512,027
Depreciation and amortization, net of (gains) losses on disposals | 279,594 | 255,372 | 222,692
Interest expense | 92,692 | 90,696 | 90,371
Pretax earnings | 537,522 | 408,487 | 325,636
Income tax expense | 195,131 | 143,779 | 120,269
Identifiable assets | 5,998,978 | 5,306,601 | 4,654,051
United States [Member] |  |  |
Fiscal year ended: |  |  |
Total revenues | 2,681,800 | 2,409,291 | 2,364,560
Depreciation and amortization, net of (gains) losses on disposals | 272,236 | 247,413 | 214,800
Interest expense | 92,128 | 90,137 | 89,730
Pretax earnings | 516,207 | 389,342 | 302,748
Income tax expense | 189,419 | 138,911 | 114,050
Identifiable assets | 5,854,545 | 5,160,889 | 4,518,772
Canada [Member] |  |  |
Fiscal year ended: |  |  |
Total revenues | 153,452 | 149,296 | 147,467
Depreciation and amortization, net of (gains) losses on disposals | 7,358 | 7,959 | 7,892
Interest expense | 564 | 559 | 641
Pretax earnings | 21,315 | 19,145 | 22,888
Income tax expense | 5,712 | 4,868 | 6,219
Identifiable assets | $ 144,475 | $ 145,712 | $ 135,279

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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 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 18 -Article 5 + Details
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