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Valuation and Qualifying Accounts and Reserves (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended |  |  |  |  | 12 Months Ended
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Jul. 31, 2012 Inventory Reserves [Member] | Jul. 31, 2011 Inventory Reserves [Member] | Jul. 31, 2010 Inventory Reserves [Member] | Jul. 31, 2012 Valuation Allowance On Income Taxes [Member] | Jul. 31, 2011 Valuation Allowance On Income Taxes [Member] | Jul. 31, 2010 Valuation Allowance On Income Taxes [Member] | Jul. 31, 2009 Valuation Allowance On Income Taxes [Member] | Jul. 31, 2012 Trade Receivable Allowances [Member] | Jul. 31, 2011 Trade Receivable Allowances [Member] | Jul. 31, 2010 Trade Receivable Allowances [Member]
Balance at Beginning of Period | $ 1,552 | $ 1,452 | $ 1,455 | $ 1,588 | $ 1,588 | $ 1,588 | $ 1,588 | $ 3,423 | $ 2,259 | $ 1,877
Charged to Costs and Expenses | 1,914 | 2,389 | 2,310 |  |  |  |  | 2,456 | 2,246 | 1,328
Deductions | (1,602) | (2,289) | (2,313) |  |  |  |  | (1,326) | (1,082) | (946)
Balance at End of Period | $ 1,864 | $ 1,552 | $ 1,452 | $ 1,588 | $ 1,588 | $ 1,588 | $ 1,588 | $ 4,553 | $ 3,423 | $ 2,259

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- Definition Total of allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 09 -Article 12 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e24092-122690 + Details
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Period Type: | instant

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- Definition Total of allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs, charged to costs and expenses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 09 -Article 12 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e24092-122690 + Details
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- Definition Total of the deductions in a given period to allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs, representing receivables written off as uncollectible and portions of the reserves utilized, respectively. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 09 -Article 12 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e24092-122690 + Details
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