Stockholders' Equity (Details) - USD ($)						12 Months Ended
	Nov. 15, 2019	Aug. 16, 2019	May 17, 2019	Feb. 15, 2019	Nov. 16, 2018	Jul. 31, 2019	Jul. 31, 2018	Sep. 24, 2019	Jun. 05, 2019	Mar. 06, 2019	Dec. 06, 2018	Sep. 26, 2018
Class of Stock [Line Items]
Shelf registration authorized amount											$ 400,000,000
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 (in dollars per share)									$ 0.1	$ 0.1	$ 0.1	$ 0.10
Dividends paid (in dollars per share)			$ 0.1	$ 0.1	$ 0.1
Subsequent Event
Stock Repurchase Program
Amount that remains to be expended under the current board repurchase authorization								$ 8,664,000
Dividends
Dividends declared (in dollars per share)								$ 0.1
Dividends paid (in dollars per share)		$ 0.1
Scenario, Forecast
Dividends
Dividends paid (in dollars per share)	$ 0.10