Stockholders' Equity Stock-Option Activity and Related Share-Based Compensation Expense (Details) shares in Thousands	9 Months Ended
	Apr. 30, 2016 $ / shares shares
Number of Shares
Options outstanding, beginning balance | shares	8,713
Options granted, number of shares (in shares) | shares	9
Options exercised, number of shares (in shares) | shares	(1,567)
Options canceled or expired, number of shares (in shares) | shares	(328)
Options outstanding, ending balance | shares	6,827
Weighted Average Exercise Price Per Share
Weighted average exercise price per share, Beginning Balance (in USD per share) | $ / shares	$ 69.13
Options granted, weighted average exercise price per share (in USD per share) | $ / shares	94.88
Options exercised, weighted average exercise price per share (in USD per share) | $ / shares	45.72
Options canceled or expired, weighted average exercise price per share (in USD per share) | $ / shares	75.18
Weighted average exercise price per share, Beginning Balance (in USD per share) | $ / shares	$ 74.24
Exercisable (in shares) | shares	3,802
Exercisable, Weighted average exercise price per share (in USD per share) | $ / shares	$ 58.37