Contingent Liabilities And Commitments (Narratives) (Details) $ in Millions	3 Months Ended
Jun. 30, 2018 USD ($)
Operating leases, rental equipment [Abstract]
Lease expiration year	2024
Guaranteed residual value	$ 14.2
Lease equipment start date	1987

The estimate of the value of the leased asset at the end of the lease term.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 30
-Section 30
-Paragraph 14
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=77895730&loc=d3e42840-112730

Name:	us-gaap_LeveragedLeasesNetInvestmentInLeveragedLeasesDisclosureResidualValueOfLeasedAssets
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant