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Related-Party Transactions	12 Months Ended
Related-Party Transactions	Jan. 31, 2017
Related Party Transactions [Abstract]
Related-Party Transactions	16. Related-Party Transactions The Company considers an entity to be a related party if it owns more than 10% of the Company’s total voting stock at the end of each reporting period or if an officer or employee of an entity also serves on the Company’s board of directors or if it is a significant shareholder and has material business transactions with the Company. The Company leases software licenses with Cadence Design Systems, Inc. (“Cadence”). A member of the Company’s Board of Directors is also the Chief Executive Officer, President and a Director of Cadence. The Company paid $2.8 million, $2.8 million and $2.3 million of license fee for the years ended January 31, 2017, 2016 and 2015, respectively. License expense related to these agreements included in research and development expense was approximately $2.9 million, $2.7 million and $1.9 million for the years ended January 31, 2017, 2016 and 2015, respectively.