Related Party Transactions (Details Textuals) $ in Millions	12 Months Ended
Jul. 31, 2015 USD ($) property	Jul. 31, 2014 USD ($)	Jul. 31, 2013 USD ($) Derivative
Board of Directors and Officers
Related Party Transactions, By Related Party [Abstract]
Rental payments	$ 0.8	$ 1.4	$ 0.4
Executive Officer
Related Party Transactions, By Related Party [Abstract]
Related party transaction number of property purchased	3		1
Related party property purchased amount	$ 11.9	$ 1.8	$ 1.1

Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 30

-Section 30

-Paragraph 7

-URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 30

-Section 50

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 30

-Section 30

-Paragraph 8

-URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477

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