Stockholders' Equity - Summary of the Stock Repurchase Program (Details) $ / shares in Units, $ in Thousands	6 Months Ended
	Apr. 30, 2018 USD ($) $ / shares shares
Shares Repurchased
Cumulative balance at October 31, 2017 (in shares) | shares	0
Repurchase of common stock under the stock repurchase program (in shares) | shares	1,627,233
Cumulative balance at April 30, 2018 (in shares) | shares	1,627,233
Weighted-Average Price per Share
Cumulative balance at October 31, 2017 (in dollars per share) | $ / shares	$ 0.00
Repurchase of common stock under the stock repurchase program (in dollars per share) | $ / shares	24.06
Cumulative balance at April 30, 2018 (in dollars per share) | $ / shares	$ 24.06
Amount Repurchased (in thousands)
Cumulative balance at October 31, 2017 | $	$ 0
Repurchase of common stock under the stock repurchase program | $	39,147
Cumulative balance at April 30, 2018 | $	$ 39,147