Revenue Recognition (Details 2) - USD ($) $ in Thousands	3 Months Ended
Oct. 31, 2019	Oct. 31, 2018
Contract Liabilities [Member]
Revenue from External Customer [Line Items]
Revenue recognized in the period from amounts included in the contract liability balance at the beginning of the period	$ 29,112	$ 28,506

Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 8
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130549-203045

Name:	us-gaap_ContractWithCustomerLiabilityRevenueRecognized
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration