Leases - Weighted Average Remaining Lease Term and Discount Rates (Details)	Mar. 31, 2020	Mar. 31, 2019
Offices
Weighted average remaining lease term (years)
Weighted average remaining lease term (years)	4 years 6 months	5 years 4 months 24 days
Weighted average discount rate
Weighted average discount rate	2.50%	2.60%
Data Centers
Weighted average remaining lease term (years)
Weighted average remaining lease term (years)	3 years	3 years
Weighted average discount rate
Weighted average discount rate	1.70%	1.70%

Weighted average remaining lease term for operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 55
-Paragraph 53
-URI http://asc.fasb.org/extlink&oid=77888399&loc=SL77918982-209971

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (g)(3)
-URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918686-209980

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