Basis of Presentation (Details)	3 Months Ended
Oct. 31, 2016
Straight Path [Member]
Basis of Presentation (Textual)
Ownership in straight path spectrum	100.00%
Straight Path IP Group [Member]
Basis of Presentation (Textual)
Ownership in straight path spectrum	84.50%

Percentage of subsidiary's or equity method investee's stock owned by parent immediately after all stock transactions.

No definition available.

Name:	us-gaap_SubsidiaryOrEquityMethodInvesteeCumulativePercentageOwnershipAfterAllTransactions
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration