Stockholders' Equity - Dividends (Details) - USD ($) $ / shares in Units, $ in Millions			3 Months Ended	6 Months Ended
Feb. 09, 2022	Feb. 09, 2021	Jan. 31, 2022	Jan. 31, 2021	Apr. 30, 2022	Apr. 30, 2021
Stockholders' Equity Note [Abstract]
Dividends on common stock	$ 1.5	$ 1.5			$ 1.5	$ 1.5
Dividends on common stock (in dollars per share)	$ 0.03	$ 0.03	$ 0.03	$ 0.03

Aggregate dividends paid during the period for each share of common stock outstanding.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770

Name:	us-gaap_CommonStockDividendsPerShareCashPaid
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	duration