Subsequent Event (Details) (Subsequent event., USD $) In Millions, unless otherwise specified	3 Months Ended
Jun. 30, 2015
Subsequent event.
Subsequent events
Pretax income as a result of litigation settlement	$ 2.5

Amount of judgment or settlement awarded to (against) the entity in respect of litigation.

No definition available.

Name:	us-gaap_LitigationSettlementAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration