Business Segment Information (Details Textual) - Segment		6 Months Ended
	Feb. 01, 2016	Jan. 31, 2016
Business Segment Information (Textual)
Reportable Segments		2
Straight Path IP Group [Member]
Business Segment Information (Textual)
Percentage of general and administrative expenses		80.00%
Straight Path IP Group [Member] | Subsequent Event [Member]
Business Segment Information (Textual)
Percentage of general and administrative expenses	20.00%
Straight Path Spectrum [Member]
Business Segment Information (Textual)
Percentage of general and administrative expenses		20.00%
Straight Path Spectrum [Member] | Subsequent Event [Member]
Business Segment Information (Textual)
Percentage of general and administrative expenses	80.00%