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Income Taxes (Narrative) (Details) (USD $) In Thousands | 12 Months Ended
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Jul. 31, 2011 | Jul. 31, 2010 | Jul. 31, 2009
Income Taxes |  |  |
Current federal tax expense, ending balance | $ 48,943 | $ 55,462 | $ (2,563)
Current federal tax expense benefit period decrease | 6,519 | 58,025 |
Decrease in income taxes due to reduction in pre-tax income | 6,568 |  |
Increase in income taxes due to increase in pre-tax income |  | 51,800 |
Increase (decrease) in pretax income | (18,766) | 147,998 |
Current federal tax expense increase due to disallowed executive compensation |  | 1,578 |
Increases in various temporary items | 1,207 | 5,902 |
Decrease in current federal tax expense due to disallowed executive compensation | 1,578 |  |
Increase (decrease) in current federal tax expense due to domestic manufacturing deduction | (1,491) | (3,325) |
Decrease in unrecognized tax benefits related to lapses in the statute of limitations |  | 3,027 |
Increase (decrease) in federal tax expenses due to nondeductible goodwill |  | (3,235) |
Decrease in current state tax expense due to decrease in unrecognized tax benefits | 2,329 |  |
Current state tax expense | 250 | 9,337 | 3,304
Current state and local tax expense benefit period increase (decrease) | (9,087) | 6,033 |
Current state and local tax expenses increase (decrease) due to pre-tax income | (657) | 6,956 |
Current state tax expense decrease due to disallowed executive compensation | 212 |  |
Current state tax expense increase due to disallowed executive compensation |  | 212 |
Current state tax expense increase decrease in various temporary items | 232 | 635 |
Decrease in current state tax expense due to blended tax rate | 3,731 |  |
Increase (decrease) in unrecognized tax benefits |  | 1,096 |
Decrease in current state tax expenses result of nondeductible goodwill |  | 472 |
Income before income taxes includes foreign income (loss) | 0 | (8,154) | (2,659)
Increase (decrease) in net deferred tax assets | 29,966 | 3,227 |
Net deferred tax assets, ending balance | 16,729 | 46,695 |
Decrease in deferred tax assets due to increased intangibles liability | 32,647 |  |
Decrease in deferred tax assets due to increased liability in property basis | 3,614 |  |
Decrease in deferred tax assets offset by increase in deferred compensation | 1,117 |  |
Decrease in deferred tax assets offset by increase in accrued expenses | 1,850 |  |
Increase in deferred tax asset due to increase in product warranty reserves |  | 3,622 |
Increase in deferred tax asset due to employee benefits |  | 1,491 |
Decrease in deferred tax asset for unrecognized tax benefits |  | 1,653 |
Capital loss carry forward expected to be realized | 38 | 1,843 |
Increase in liability for unrecognized tax benefits due to federal benefit |  |  | 11,031
Unrecognized tax benefits that, if recognized, would affect the company's income tax rate | 21,453 | 20,719 | 19,944
Total amount of liabilities accrued for interest and penalties related to unrecognized tax benefits | 12,533 | 13,326 | 17,100
Total amount of interest and penalties recognized | (995) | (2,200) | 1,320
Expected decrease in unrecognized tax benefits due to resolution of uncertain tax positions | 3,515 |  |
Expected decrease in interest due to resolution of uncertain tax positions | 761 |  |
Expected decrease in penalties due to resolution of uncertain tax positions | $ 29 |  |

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