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Valuation And Qualifying Accounts And Reserves (Details) (USD $) In Thousands	12 Months Ended							12 Months Ended
	Jul. 31, 2011 Inventory Reserves [Member]	Jul. 31, 2010 Inventory Reserves [Member]	Jul. 31, 2009 Inventory Reserves [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, 2008 Valuation Allowance On Income Taxes [Member]	Jul. 31, 2011 Trade Receivable Allowances [Member]	Jul. 31, 2010 Trade Receivable Allowances [Member]	Jul. 31, 2009 Trade Receivable Allowances [Member]
Balance at Beginning of Period	$ 1,452	$ 1,455	$ 1,211	$ 1,588	$ 1,588	$ 1,588	$ 1,588	$ 2,259	$ 1,877	$ 1,666
Charged to Costs and Expenses	2,389	2,310	2,496					2,246	1,328	2,109
Deductions	(2,289)	(2,313)	(2,252)					(1,082)	(946)	(1,898)
Balance at End of Period	$ 1,552	$ 1,452	$ 1,455	$ 1,588	$ 1,588	$ 1,588	$ 1,588	$ 3,423	$ 2,259	$ 1,877

X

- 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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Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- 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

Name:	us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- 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

Name:	us-gaap_ValuationAllowancesAndReservesDeductions
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration