Consolidated Statements of Financial Position (Parenthetical)	Mar. 31, 2018 € / shares	Mar. 31, 2018 $ / shares	Sep. 30, 2017 € / shares	Sep. 30, 2017 $ / shares
Ordinary shares, par value		$ 0.01		$ 0.01
Preferred shares, par value		$ 0.01		$ 0.01
Common Class A [Member]
Ordinary shares, par value \| € / shares	€ 1.00		€ 1.00

Face amount or stated value per share of preferred stock nonredeemable or redeemable solely at the option of the issuer.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(28))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Name:	us-gaap_PreferredStockParOrStatedValuePerShare
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant