Stockholders' Equity (Details) - USD ($)							3 Months Ended		6 Months Ended
	May 15, 2020	Mar. 04, 2020	Feb. 14, 2020	Dec. 04, 2019	Nov. 15, 2019	Sep. 24, 2019	Jan. 31, 2020	Oct. 31, 2018	Jan. 31, 2020	Jan. 31, 2019	Dec. 06, 2018
Class of Stock [Line Items]
Amount under shelf registration											$ 400,000,000
Treasury Stock Transactions, Excluding Value of Shares Reissued [Abstract]
Stock repurchase program, remaining authorized repurchase amount							$ 8,664,000		$ 8,664,000
Maximum amount authorized by the Board of Directors for repurchases of the Company's common stock							$ 100,000,000		$ 100,000,000
Repurchases (in shares)									0	0
Dividends [Abstract]
Dividends declared (in dollars per share)				$ 0.1		$ 0.1	$ 0.10	$ 0.10	$ 0.20	$ 0.20
Dividends, cash paid (in dollars per share)					$ 0.10
Subsequent Event
Treasury Stock Transactions, Excluding Value of Shares Reissued [Abstract]
Stock repurchase program, remaining authorized repurchase amount		$ 8,664,000
Dividends [Abstract]
Dividends declared (in dollars per share)		$ 0.10
Dividends, cash paid (in dollars per share)			$ 0.10
Forecast
Dividends [Abstract]
Dividends, cash paid (in dollars per share)	$ 0.10