Revenues and Gain on Sale of Rights in Wireless Spectrum (Tables)

12 Months Ended

Jul. 31, 2013

Revenues And Gainon Sale Of Wireless Spectrum Rights [Abstract]

Summary of revenues and gain on sale

Year ended July 31 (in thousands)	2013		2012
Customer:
Covad Communications Group	$	165	$	161
AT&T		134		124
Verizon	na			90