Stockholders' Equity (Details) - USD ($)						1 Months Ended	12 Months Ended
	Nov. 16, 2018	Aug. 17, 2018	May 18, 2018	Feb. 16, 2018	Nov. 17, 2017	Jun. 30, 2016	Jul. 31, 2018	Jul. 31, 2017	Jul. 31, 2016	Sep. 26, 2018	Jun. 06, 2018	Mar. 07, 2018	Dec. 06, 2017	Sep. 27, 2017
Class of Stock [Line Items]
Common stock issued in a public offering (in shares)						7,145,000
Common stock price per share in a public offering (in dollars per share)						$ 14
Proceeds received from equity offering						$ 95,029,000	$ 0	$ 0	$ 95,029,000
Aggregate registered amount remained available for sale of securities, including debt, under the existing shelf registration statement							74,970,000
Total issuance costs related to common stock offering									1,112,000
Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs									$ 959,000
Stock Repurchase Program
Amount that remains to be expended under the current board repurchase authorization							8,664,000
Maximum amount authorized by the board of directors for the repurchase of shares of the company's common stock							$ 100,000,000
Shares acquired (in shares)							0	0
Dividends
Dividends declared											$ 0.1	$ 0.1	$ 0.1	$ 0.10
Dividends paid			$ 0.1	$ 0.1	$ 0.1
Subsequent Event
Class of Stock [Line Items]
Aggregate registered amount remained available for sale of securities, including debt, under the existing shelf registration statement										$ 74,970,000
Stock Repurchase Program
Amount that remains to be expended under the current board repurchase authorization										$ 8,664,000
Dividends
Dividends declared										$ 0.1
Dividends paid		$ 0.1
Scenario, Forecast [Member]
Dividends
Dividends paid	$ 0.10