Revenue Recognition (Details Textual) - ASC 606 [Member] $ in Millions	6 Months Ended
Jan. 31, 2019 USD ($)
Revenue Recognition (Textual)
Deferred revenue	$ 8.6
Accumulated deficit [Member]
Revenue Recognition (Textual)
Deferred Customer Contract Acquisition Costs	1.3
Other current assets [Member]
Revenue Recognition (Textual)
Defer costs	0.6
Other assets [Member]
Revenue Recognition (Textual)
Defer costs	$ 0.7

Amount of deferred revenue as of balance sheet date. Deferred revenue represents collections of cash or other assets related to a revenue producing activity for which revenue has not yet been recognized. Generally, an entity records deferred revenue when it receives consideration from a customer before achieving certain criteria that must be met for revenue to be recognized in conformity with GAAP.

No definition available.

Name:	us-gaap_DeferredRevenue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant