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Stockholder's Equity (Details Textuals 1) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended			12 Months Ended			94 Months Ended
	Apr. 30, 2019	Jan. 31, 2019	Oct. 31, 2017	Jul. 31, 2019	Jul. 31, 2018	Jul. 31, 2017	Jul. 31, 2019	Sep. 22, 2011
Targeted or Tracking Stock, Stock [Line Items]
Document Period End Date				Jul. 31, 2019
Stock Repurchase [Abstract]
Stock repurchase price per share (in dollars per share)				$ 47.81			$ 47.81
Company repurchased common stock				$ 365,000
Payments for Employee Stock-Based Tax Withholdings	$ 45,565	$ 0	$ 134,615	$ 46,888	$ 1,115	$ 135,433
Stock Repurchase Program 2011 [Member]
Stock Repurchase [Abstract]
Additional common stock authorized for repurchase (in shares)								80,000,000
Common stock authorized for repurchase (in shares)								196,000,000
Company repurchased common stock (in shares)				7,635,596			114,549,198
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased				81,450,802			81,450,802
Settlement with Taxing Authority [Member]
Stock Repurchase [Abstract]
Payments for Employee Stock-Based Tax Withholdings				$ 45,600	$ 0	$ 134,600

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Equity impact of the value of stock that has been repurchased and retired during the period. The excess of the purchase price over par value can be charged against retained earnings (once the excess is fully allocated to additional paid in capital).

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