Consolidated Condensed Balance Sheets (Parenthetical) (USD $)	Apr. 30, 2011	Jul. 31, 2010	Apr. 30, 2010
Consolidated Condensed Balance Sheets
Preferred stock, par value	$ 0.01	$ 0.01	$ 0.01
Preferred stock, shares authorized	25,000,000	25,000,000	25,000,000
Preferred stock, shares issued	0	0	0
Preferred stock, shares outstanding	0	0	0
Common stock, par value	$ 0.01	$ 0.01	$ 0.01
Common stock, shares authorized	100,000,000	100,000,000	100,000,000
Common stock, shares issued	40,332,251	40,173,891	40,170,403
Treasury stock, shares	4,264,804	4,264,804	3,878,535

Consolidated Condensed Balance Sheets Abstract

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- Definition

Face amount or stated value of common stock per share; generally not indicative of the fair market value per share.

+ References

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-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 129
-Paragraph 4

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-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 30
-Article 5

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The maximum number of common shares permitted to be issued by an entity's charter and bylaws.

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-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
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-Paragraph 30
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Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.

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-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 30
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- Definition

Face amount or stated value per share of nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer); generally not indicative of the fair market value per share.

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-Publisher AICPA
-Name Accounting Principles Board Opinion (APB)
-Number 12
-Paragraph 10

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-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 29
-Article 5

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-Name Statement of Financial Accounting Standard (FAS)
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-Paragraph 2, 3, 4, 5, 6, 7, 8

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The maximum number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) permitted to be issued by an entity's charter and bylaws.

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-Name Statement of Financial Accounting Standard (FAS)
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Total number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) issued to shareholders (includes related preferred shares that were issued, repurchased and remain in the treasury). May be all or portion of the number of preferred shares authorized. Excludes preferred shares that are classified as debt.

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Aggregate share number for all nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) held by stockholders. Does not include preferred shares that have been repurchased.

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Number of common and preferred shares that were previously issued and that were repurchased by the issuing entity and held in treasury on the financial statement date. This stock has no voting rights and receives no dividends.

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-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 29, 30
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