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Segment Reporting (Summary Of Segment Detail) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jul. 31, 2015 | Apr. 30, 2015 | Jan. 31, 2015 | Oct. 31, 2014 | Jul. 31, 2014 | Apr. 30, 2014 | Jan. 31, 2014 | Oct. 31, 2013 | Jul. 31, 2015 | Jul. 31, 2014 | Jul. 31, 2013
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 610,578 | $ 575,588 | $ 588,537 | $ 596,510 | $ 668,226 | $ 624,234 | $ 581,622 | $ 599,384 | $ 2,371,213 | $ 2,473,466 | $ 2,436,948
Depreciation and amortization |  |  |  |  |  |  |  |  | 74,298 | 67,163 | 64,290
Equity earnings in unconsolidated affiliates |  |  |  |  |  |  |  |  | 5,110 | 6,536 | 4,693
Earnings before income taxes |  | $ 67,849 | $ 65,424 |  |  |  |  |  | 288,603 | 360,703 | 348,181
Assets | 1,809,534 |  |  |  | 1,942,411 |  |  |  | 1,809,534 | 1,942,411 | 1,743,556
Equity investments in unconsolidated affiliates | 18,344 |  |  |  | 21,398 |  |  |  | 18,344 | 21,398 | 18,840
Capital expenditures |  |  |  |  |  |  |  |  | 93,739 | 97,210 | 94,895
Engine Products [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 1,484,132 | 1,584,027 | 1,504,188
Depreciation and amortization |  |  |  |  |  |  |  |  | 43,279 | 38,925 | 35,815
Equity earnings in unconsolidated affiliates |  |  |  |  |  |  |  |  | 4,134 | 5,596 | 4,000
Earnings before income taxes |  |  |  |  |  |  |  |  | 186,274 | 233,920 | 220,892
Assets | 887,698 |  |  |  | 900,083 |  |  |  | 887,698 | 900,083 | 826,151
Equity investments in unconsolidated affiliates | 15,120 |  |  |  | 17,439 |  |  |  | 15,120 | 17,439 | 15,563
Capital expenditures |  |  |  |  |  |  |  |  | 54,604 | 56,340 | 52,864
Corporate And Unallocated [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Depreciation and amortization |  |  |  |  |  |  |  |  | 4,611 | 4,296 | 6,028
Earnings before income taxes |  |  |  |  |  |  |  |  | (21,033) | (7,195) | (11,819)
Assets | 287,859 |  |  |  | 470,328 |  |  |  | 287,859 | 470,328 | 389,989
Capital expenditures |  |  |  |  |  |  |  |  | 5,817 | 6,218 | 8,897
Industrial Products [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 887,081 | 889,439 | 932,760
Depreciation and amortization |  |  |  |  |  |  |  |  | 26,408 | 23,942 | 22,447
Equity earnings in unconsolidated affiliates |  |  |  |  |  |  |  |  | 976 | 940 | 693
Earnings before income taxes |  |  |  |  |  |  |  |  | 123,362 | 133,978 | 139,108
Assets | 633,977 |  |  |  | 572,000 |  |  |  | 633,977 | 572,000 | 527,416
Equity investments in unconsolidated affiliates | $ 3,224 |  |  |  | $ 3,959 |  |  |  | 3,224 | 3,959 | 3,277
Capital expenditures |  |  |  |  |  |  |  |  | $ 33,318 | $ 34,652 | $ 33,134

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