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Financial Information by Geographic Area Data | 12 Months Ended
--- | ---
Mar. 31, 2019
Segments, Geographical Areas [Abstract] |
Industry Segment and Geographic Area Data | Financial Information by Geographic Area
|  | United States |  | Canada |  | Consolidated
|  | (All amounts are in thousands U.S. $'s)
Fiscal Year Ended March 31, 2019 |  |  |  |  |  |
Total revenues | $ | 3,597,285 | $ | 171,422 | $ | 3,768,707
Depreciation and amortization, net of gains on disposal |  | 575,134 |  | 7,421 |  | 582,555
Interest expense |  | 139,573 |  | 2,872 |  | 142,445
Pretax earnings |  | 466,175 |  | 11,354 |  | 477,529
Income tax expense |  | 103,578 |  | 3,094 |  | 106,672
Identifiable assets |  | 11,526,876 |  | 364,837 |  | 11,891,713
|  | United States |  | Canada |  | Consolidated
|  | (All amounts are in thousands U.S. $'s)
Fiscal Year Ended March 31, 2018 |  |  |  |  |  |
Total revenues | $ | 3,435,821 | $ | 165,293 | $ | 3,601,114
Depreciation and amortization, net of gains on disposal |  | 363,826 |  | 8,521 |  | 372,347
Interest expense |  | 123,777 |  | 2,929 |  | 126,706
Pretax earnings |  | 628,901 |  | 8,712 |  | 637,613
Income tax expense (benefit) |  | (155,685) |  | 2,715 |  | (152,970)
Identifiable assets |  | 10,425,299 |  | 322,123 |  | 10,747,422
|  | United States |  | Canada |  | Consolidated
|  | (All amounts are in thousands U.S. $'s)
Fiscal Year Ended March 31, 2017 |  |  |  |  |  |
Total revenues | $ | 3,271,563 | $ | 150,204 | $ | 3,421,767
Depreciation and amortization, net of gains on disposal |  | 466,378 |  | 5,275 |  | 471,653
Interest expense |  | 112,834 |  | 572 |  | 113,406
Pretax earnings |  | 609,589 |  | 18,769 |  | 628,358
Income tax expense |  | 225,278 |  | 4,656 |  | 229,934
Identifiable assets |  | 9,030,528 |  | 375,312 |  | 9,405,840

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- Definition Tabular disclosure of the names of foreign countries from which revenue is material and the amount of revenue from external customers attributed to those countries. An entity may also provide subtotals of geographic information about groups of countries. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e9038-108599 + Details
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