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Marketable Securities (Details Textual) - USD ($) $ in Millions	12 Months Ended
	Jul. 31, 2015	Jul. 31, 2014	Jul. 31, 2013
Marketable Securities [Abstract]
Company received number of Straight Path Class B common stock, shares	64,624
Proceeds from maturities of available-for-sale securities	$ 24.1	$ 17.3	$ 1.7
Realized losses from sales of available-for-sale securities	0.1
Realized gains from sales of available-for-sale securities	$ 0.0	$ 0.0	$ 0.0
Unrealized losses, less than twelve months or longer
Other than temporary impairment losses, investments, available-for-sale securities		$ 0.1

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- Definition

Number of shares received in connection with the lapsing of restrictions on awards of restricted stock.

+ References

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Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 320



-SubTopic 10



-Section 50



-Paragraph 6



-Subparagraph (a)(2)



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This item represents the gross profit realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities.

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This item represents the gross loss realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities and excluding other than temporary impairments (OTTI), if any, recognized elsewhere.

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The amount by which the fair value of an investment in debt and equity securities categorized as Available-for-sale is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income.

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The cash inflow associated with the sale or maturity (principal being due) of securities not classified as either held-to-maturity securities or trading securities which are classified as available-for-sale securities.

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