Basis of Presentation, Business and Summary of Significant Accounting Policies - Initial and Secondary Public Offerings (Details) - USD ($) $ / shares in Units, $ in Thousands				3 Months Ended
	Jun. 07, 2017	Feb. 28, 2017	Jun. 01, 2016	Jul. 31, 2016
Initial and Secondary Public Offerings
Net proceeds from initial public offering			$ 156,900	$ 157,217
Second Lien Term Loan due 2022
Initial and Secondary Public Offerings
Loan repayment			$ 160,000	$ 160,000
Initial public offering | Common Stock
Initial and Secondary Public Offerings
Number of shares issued			8,050,000
Offering price (in dollars per share)			$ 21.00
Underwriters over-allotment option | Common Stock
Initial and Secondary Public Offerings
Number of shares issued			1,050,000
Selling stockholders | Secondary offering
Initial and Secondary Public Offerings
Shares sold	5,750,000	7,992,500
Price to the public (in dollars per share)	$ 33.00	$ 29.25
Selling stockholders | Underwriters over-allotment option
Initial and Secondary Public Offerings
Shares sold	750,000	1,042,500