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Industry Segment and Geographic Area Data | 6 Months Ended
--- | ---
Sep. 30, 2017
Segments, Geographical Areas [Abstract] |
12. Industry Segment and Geographic Area Data | 12. Industry Segment and Geographic Area Data
|  | United States |  | Canada |  | Consolidated
|  | (Unaudited)
|  | (All amounts are in thousands of U.S. $'s)
Quarter Ended September 30, 2017 |  |  |  |  |  |
Total revenues | $ | 988,808 | $ | 53,878 | $ | 1,042,686
Depreciation and amortization, net of (gains) losses on disposals |  | 136,597 |  | 2,325 |  | 138,922
Interest expense |  | 31,268 |  | 755 |  | 32,023
Pretax earnings |  | 192,585 |  | 4,773 |  | 197,358
Income tax expense |  | 71,280 |  | 1,439 |  | 72,719
Identifiable assets |  | 9,621,634 |  | 461,256 |  | 10,082,890
Quarter Ended September 30, 2016 |  |  |  |  |  |
Total revenues | $ | 949,915 | $ | 48,770 | $ | 998,685
Depreciation and amortization, net of (gains) losses on disposals |  | 114,794 |  | 1,099 |  | 115,893
Interest expense |  | 27,987 |  | 2 |  | 27,989
Pretax earnings |  | 270,644 |  | 8,347 |  | 278,991
Income tax expense |  | 100,272 |  | 2,244 |  | 102,516
Identifiable assets |  | 8,710,057 |  | 297,061 |  | 9,007,118
|  | United States |  | Canada |  | Consolidated
|  | (Unaudited)
|  | (All amounts are in thousands of U.S. $'s)
Six Months Ended September 30, 2017 |  |  |  |  |  |
Total revenues | $ | 1,901,922 | $ | 98,689 | $ | 2,000,611
Depreciation and amortization, net of (gains) losses on disposals |  | 268,096 |  | 3,829 |  | 271,925
Interest expense |  | 60,911 |  | 1,457 |  | 62,368
Pretax earnings |  | 384,558 |  | 11,486 |  | 396,044
Income tax expense |  | 141,890 |  | 3,308 |  | 145,198
Identifiable assets |  | 9,621,634 |  | 461,256 |  | 10,082,890
Six Months Ended September 30, 2016 |  |  |  |  |  |
Total revenues | $ | 1,830,644 | $ | 91,232 | $ | 1,921,876
Depreciation and amortization, net of (gains) losses on disposals |  | 216,794 |  | 2,422 |  | 219,216
Interest expense |  | 54,413 |  | 2 |  | 54,415
Pretax earnings |  | 495,557 |  | 16,565 |  | 512,122
Income tax expense |  | 184,017 |  | 4,457 |  | 188,474
Identifiable assets |  | 8,710,057 |  | 297,061 |  | 9,007,118

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e9038-108599 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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