Investments - Summary of Cost Method Investments (Details) $ in Thousands	Jul. 31, 2016 USD ($)
Schedule of Cost-method Investments [Line Items]
Total equity investment in privately traded companies	$ 20,200
MultiPhy Ltd [Member]
Schedule of Cost-method Investments [Line Items]
Total equity investment in privately traded companies	12,000
Skorpios Technologies Inc [Member]
Schedule of Cost-method Investments [Line Items]
Total equity investment in privately traded companies	3,000
Guangdong Dapu Telecom Technology Co., Ltd [Member]
Schedule of Cost-method Investments [Line Items]
Total equity investment in privately traded companies	3,300
Senet, Inc [Member]
Schedule of Cost-method Investments [Line Items]
Total equity investment in privately traded companies	1,900
Jariet Technologies Inc [Member]
Schedule of Cost-method Investments [Line Items]
Total equity investment in privately traded companies	$ 0