Stockholders' Equity (Details) - USD ($)		1 Months Ended	3 Months Ended
	Nov. 17, 2017	Jun. 30, 2016	Oct. 31, 2017	Oct. 31, 2016	Dec. 06, 2017	Sep. 27, 2017
Class of Stock [Line Items]
Number of common stock sold in public offering (in shares)		7,145,000
Price per share (in dollars per share)		$ 14
Proceeds from sale of common stock		$ 95,029,000
Aggregate registered amount available for sale of securities under shelf registration statement			$ 74,970,000
Treasury Stock Transactions, Excluding Value of Shares Reissued [Abstract]
Stock repurchase program, remaining authorized repurchase amount			8,664,000
Maximum amount authorized by the Board of Directors for repurchases of the Company's common stock			$ 100,000,000
Repurchases of common stock (in shares)			0	0
Dividends [Abstract]
Quarterly dividend payment amount per share (in dollars per share)						$ 0.10
Subsequent Event
Class of Stock [Line Items]
Aggregate registered amount available for sale of securities under shelf registration statement					$ 74,970,000
Treasury Stock Transactions, Excluding Value of Shares Reissued [Abstract]
Stock repurchase program, remaining authorized repurchase amount					$ 8,664,000
Dividends [Abstract]
Quarterly dividend payment amount per share (in dollars per share)					$ 0.10
Dividends, cash paid (in dollars per share)	$ 0.10