Contractual interest rate for funds borrowed, under the debt agreement.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Name:	us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

Fair Value Measurements (Narrative) (Details)	Mar. 31, 2019	Jul. 31, 2018	Jul. 31, 2016	Jan. 31, 2015
Long-term debt \| 4.05% Senior Notes due January 2020
Debt Instrument [Line Items]
Stated interest rate	6.05%	5.30%	5.80%	4.05%