Leases (Narrative) (Details)	6 Months Ended
Sep. 30, 2019 renewal_period
Maximum
Lessee, Lease, Description [Line Items]
Leases, remaining lease term	10 years
Building
Lessee, Lease, Description [Line Items]
Finance lease, number of renewal periods	4
Finance lease, renewal term (in years)	5 years

Term of lessee's finance lease renewal, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918673-209980

Name:	us-gaap_LesseeFinanceLeaseRenewalTerm1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	instant