Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

No definition available.

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

SUBSEQUENT EVENT (Details) - USD ($)	Aug. 23, 2018	Jan. 31, 2016	Sep. 30, 2015	Apr. 30, 2015	Apr. 30, 2007	May 31, 2005	Aug. 31, 2003	May 31, 2000
Subsequent Event [Line Items]
Authorized stock repurchase amount		$ 450,000,000	$ 400,000,000	$ 350,000,000	$ 300,000,000	$ 200,000,000	$ 100,000,000	$ 50,000,000
Subsequent Event
Subsequent Event [Line Items]
Authorized stock repurchase amount	$ 200,000,000