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Industry Segment and Geographic Area Data | 6 Months Ended
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Sep. 30, 2014
Segments, Geographical Areas [Abstract] |
12. Industry Segment and Geographic Area Data | 11. Industry Segment and Geographic Area Data
|  | United States |  | Canada |  | Consolidated
|  | (Unaudited)
|  | (All amounts are in thousands of U.S. $'s)
Quarter ended September 30, 2014 |  |  |  |  |  |
Total revenues | $ | 852,935 | $ | 53,556 | $ | 906,491
Depreciation and amortization, net of (gains) losses on disposals |  | 69,845 |  | 1,511 |  | 71,356
Interest expense |  | 24,748 |  | 129 |  | 24,877
Pretax earnings |  | 237,800 |  | 9,078 |  | 246,878
Income tax expense |  | 88,225 |  | 2,406 |  | 90,631
Identifiable assets |  | 6,681,237 |  | 188,554 |  | 6,869,791
Quarter ended September 30, 2013 |  |  |  |  |  |
Total revenues | $ | 789,453 | $ | 49,770 | $ | 839,223
Depreciation and amortization, net of (gains) losses on disposals |  | 67,355 |  | 1,910 |  | 69,265
Interest expense |  | 22,977 |  | 141 |  | 23,118
Pretax earnings (loss) |  | 207,480 |  | 9,368 |  | 216,848
Income tax expense |  | 76,374 |  | 2,483 |  | 78,857
Identifiable assets |  | 5,626,460 |  | 149,885 |  | 5,776,345
|  | United States |  | Canada |  | Consolidated
|  | (Unaudited)
|  | (All amounts are in thousands of U.S. $'s)
Six Months ended September 30, 2014 |  |  |  |  |  |
Total revenues | $ | 1,625,978 | $ | 99,468 | $ | 1,725,446
Depreciation and amortization, net of (gains) losses on disposals |  | 133,885 |  | 2,706 |  | 136,591
Interest expense |  | 48,767 |  | 258 |  | 49,025
Pretax earnings |  | 424,707 |  | 17,222 |  | 441,929
Income tax expense |  | 156,644 |  | 4,564 |  | 161,208
Identifiable assets |  | 6,681,237 |  | 188,554 |  | 6,869,791
Six Months ended September 30, 2013 |  |  |  |  |  |
Total revenues | $ | 1,495,542 | $ | 92,638 | $ | 1,588,180
Depreciation and amortization, net of (gains) losses on disposals |  | 126,525 |  | 3,857 |  | 130,382
Interest expense |  | 46,163 |  | 283 |  | 46,446
Pretax earnings |  | 379,236 |  | 16,660 |  | 395,896
Income tax expense |  | 140,522 |  | 4,415 |  | 144,937
Identifiable assets |  | 5,626,460 |  | 149,885 |  | 5,776,345

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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 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: 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=6534315&loc=d3e9038-108599 + Details
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