Investments - Summary of Cost Method Investments (Details) - USD ($) $ in Thousands	Oct. 30, 2016	Jan. 31, 2016
Schedule of Cost-method Investments [Line Items]
Total cost method investment in privately traded companies	$ 22,200	$ 20,200
MultiPhy Ltd [Member]
Schedule of Cost-method Investments [Line Items]
Total cost method investment in privately traded companies	14,000	12,000
Skorpios Technologies Inc [Member]
Schedule of Cost-method Investments [Line Items]
Total cost method investment in privately traded companies	3,000	3,000
Guangdong Dapu Telecom Technology Co., Ltd [Member]
Schedule of Cost-method Investments [Line Items]
Total cost method investment in privately traded companies	3,300	3,300
Senet, Inc [Member]
Schedule of Cost-method Investments [Line Items]
Total cost method investment in privately traded companies	1,900	1,900
Jariet Technologies Inc [Member]
Schedule of Cost-method Investments [Line Items]
Total cost method investment in privately traded companies	$ 0	$ 0