Stockholders' Equity (Details) - shares	Sep. 30, 2019	Jan. 21, 2015
Share repurchase program
Stock Repurchase Program, Number of Shares Authorized to be Repurchased		20,000,000.0
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased	3,600,000

The remaining number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan.

No definition available.

Name:	us-gaap_StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchased
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant