Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Share Repurchase (Narrative) (Details) - USD ($) $ in Millions	Oct. 31, 2017	Sep. 30, 2017
Share Repurchase [Line Items]
Stock Repurchase Program Number of Shares Repurchased		0
Subsequent event [Member]
Share Repurchase [Line Items]
Authorized share repurchase amount	$ 3.0