Subsequent Events (Details) - $ / shares	Feb. 20, 2020	Jan. 31, 2020	Oct. 31, 2019
Subsequent Event [Line Items]
Preferred stock, par value (usd per share)		$ 0.01	$ 0.01
Subsequent event
Subsequent Event [Line Items]
Common stock dividends, preferred share purchase right declared (in shares)	1
Exercise price per right (usd per share)	$ 100
Common stock ownership percentage required to purchase additional shares	20.00%
Maximum common stock ownership percentage that can be acquired for rights to be exchangeable	50.00%
Redemption price per right (usd per share)	$ 0.01
Series A Junior Participating Preferred Stock | Subsequent event
Subsequent Event [Line Items]
Number of preferred stock called by each right (in shares)	0.01
Preferred stock, par value (usd per share)	$ 0.01
Common Stock | Subsequent event
Subsequent Event [Line Items]
Number of shares exchanged for each outstanding right (in shares)	1