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Summary of Significant Accounting Policies Inventories (Details) - USD ($) $ in Thousands | 12 Months Ended
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Jul. 31, 2017 | Jul. 31, 2016
Inventory Disclosure [Abstract] |  |
Percentage of LIFO Inventory | 13.50% | 14.00%
Inventory, LIFO Reserve, Effect on Income, Net | $ 6,807 | $ 6,929

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- References No definition available. + Details
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- Definition The difference between the change in the inventory reserve representing the cumulative difference in cost between the first in, first out and the last in, first out inventory valuation methods and any LIFO decrement which have been reflected in the statement of income during the period. + References No definition available. + Details
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- Definition The percentage of LIFO (last in first out) inventory to total inventory as of the balance sheet date if other than 100 percent. + References No definition available. + Details
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