Stock-Based Compensation - Summary of the Activity for Stock Option Awards (Details) - Stock options [Member] $ / shares in Units, shares in Thousands, $ in Thousands	6 Months Ended
	Jul. 31, 2016 USD ($) $ / shares shares
Number of Shares
Beginning balance (in shares)	1,507
Options granted (in shares)	228
Options exercised (in shares)	(53)
Options cancelled/forfeited (in shares)	(78)
Ending balance (in shares)	1,604
Exercisable at end of period (in shares)	865
Weighted Average Exercise Price (per share)
Beginning balance | $ / shares	$ 25.18
Options granted | $ / shares	17.61
Options exercised | $ / shares	17.64
Options cancelled/forfeited | $ / shares	22.52
Ending balance | $ / shares	24.48
Exercisable at end of period (in dollars per share) | $ / shares	$ 26.56
Aggregate Intrinsic Value
Beginning balance | $	$ 962
Options exercised | $	292
Ending balance | $	4,311
Exercisable at end of period | $	1,073
Aggregate Unrecognized Compensation
Beginning balance | $	3,748
Ending balance | $	$ 3,542
Number of Shares Exercisable
Exercisable at beginning of period (in shares)	775
Exercisable at end of period (in shares)	865
Weighted Average Contractual Term (in years)
Exercisable at end of period	2 years 5 months