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Stockholder's Equity (Details Textuals 3) - USD ($) $ / shares in Units, $ in Millions	1 Months Ended		6 Months Ended	12 Months Ended
	Oct. 31, 2013	Dec. 31, 2007	Jan. 31, 2014	Jul. 31, 2019	Jul. 31, 2018	Jul. 31, 2017
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Stock Repurchased and Retired During Period Cost Per Share				$ 47.81
Equity Incentive 2007 Plan
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Maximum vesting term for incentive and non-qualified stock options determined by board of directors		10 years
Share-based compensation arrangement by share-based payment award, award requisite service period		5 years
October 2013 Grants
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Nonqualified stock options to purchase shares, exercise price			$ 17.81
Term for not granting cash salary or bonus compensation in excess of $ 1.00 per year	5 years
Deferred compensation arrangement with individual - requisite service period	5 years
Percentage of total aggregate options vested on April 14, 2010	20.00%
Vesting term of second group of options	4 years
Total compensation expense to be recognized per grant				$ 38.8
Recognized compensation expense				$ 4.3	$ 7.2	$ 7.5
Fair value of each option of grant	$ 5.72
A. Jayson Adair | October 2013 Grants
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Nonqualified stock options to purchase shares			4,000,000
Vincent W. Mitz | October 2013 Grants
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Nonqualified stock options to purchase shares			3,000,000

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