Stockholders' Equity - Narrative (Details) - USD ($)	Sep. 30, 2017	Aug. 28, 2017
Equity [Abstract]
Authorized increase to stock repurchase plan		$ 40,000,000
Common stock available for future share repurchases, amount	$ 38,600,000	$ 200,000

Amount remaining of a stock repurchase plan authorized.

No definition available.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant