Derivatives and Hedging Activities (Interest Rates Narrative) (Details) $ in Millions	Apr. 30, 2019 USD ($)
Interest rate swap agreement
Derivative [Line Items]
Derivative, notional amount	$ 100.0
Interest Rate Swap, Maturing April 30, 2024
Derivative [Line Items]
Derivative, notional amount	50.0
Interest Rate Swap, Maturing April 30, 2026
Derivative [Line Items]
Derivative, notional amount	$ 50.0

Nominal or face amount used to calculate payment on derivative.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=125515794&loc=SL5580258-113959

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=125515794&loc=SL5579245-113959

Name:	us-gaap_DerivativeNotionalAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant