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Income Taxes - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Jul. 31, 2012 | Jul. 31, 2011 | Jul. 31, 2010
Income Taxes [Line Items] |  |  |
Current federal tax expense, ending balance | $ 57,736 | $ 48,943 | $ 55,462
Current federal tax expense benefit period increase (decrease) | 8,793 | (6,519) |
Increase in income taxes due to increase in pre-tax income | 9,822 |  |
Increase (decrease) in pretax income | 28,064 | (18,766) |
Increase (decrease) in current federal tax expense due reduced income tax credits and incentives | 1,441 |  |
Increase (decrease) in current federal tax expense due to domestic manufacturing deduction | (409) | (1,491) |
Increases (decrease) in various temporary items | (1,586) | 1,207 |
Decrease in income taxes due to reduction in pre-tax income |  | (6,568) |
Decrease in current federal tax expense due to disallowed executive compensation |  | (1,578) |
Current state and local tax expense benefit period increase (decrease) | 4,408 | (9,087) |
Current state tax expense | 4,658 | 250 | 9,337
Current state and local tax expenses increase (decrease) due to increase (decrease) in pre-tax income | 617 | (657) |
Increase (decrease) in current state tax expense due to increase (decrease) in unrecognized tax benefits | 4,244 | (2,329) |
Current state tax expense increase decrease in various temporary items |  | 232 |
Decrease in current state tax expenses result of reduction in company's state blended tax rate and increased income tax credits |  | (3,731) |
Current state tax expense decrease due to disallowed executive compensation |  | (212) |
Income before income taxes includes foreign income (loss) |  |  | (8,154)
Increase (decrease) in net deferred tax assets | 3,234 |  |
Net deferred tax assets, ending balance | 19,963 | 16,729 |
Increase (decrease) in deferred tax assets due to increased (decreased) intangibles liability | (1,989) |  |
Increase in deferred tax asset due to increase in product warranty reserves | 2,247 |  |
Changes in deferred tax assets offset by increase (decrease) in accrued expenses | (1,539) |  |
Capital loss carry forward expected to be realized prior to expiration | 143 |  |
Unrecognized tax benefits that, if recognized, would affect the company's income tax rate | 22,454 | 21,453 | 20,719
Total amount of liabilities accrued for interest and penalties related to unrecognized tax benefits | 13,265 | 12,533 | 13,326
Total amount of interest and penalties expense (benefit) recognized | 503 | (995) | (2,200)
Expected decrease in unrecognized tax benefits due to resolution of uncertain tax positions | 3,700 |  |
Expected decrease in interest due to resolution of uncertain tax positions | 900 |  |
Expected decrease in penalties due to resolution of uncertain tax positions | 40 |  |
Minimum |  |  |
Income Taxes [Line Items] |  |  |
Gross decrease in unrecognized tax benefit | 3,200 |  |
Decrease in accrued interest and penalties | 1,800 |  |
Maximum |  |  |
Income Taxes [Line Items] |  |  |
Gross decrease in unrecognized tax benefit | 13,100 |  |
Decrease in accrued interest and penalties | 5,800 |  |
Oregon State |  |  |
Income Taxes [Line Items] |  |  |
Tax and interest paid to finalize tax audit for tax years ended July 31, 2006 through 2008 | 113 |  |
Michigan |  |  |
Income Taxes [Line Items] |  |  |
Tax and interest paid to finalize tax audit for tax years ended July 31, 2006 through 2008 | $ 7 |  |

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