Stock Holders Equity Cash Dividends (Details) - USD ($) $ / shares in Units, $ in Millions			12 Months Ended
Jul. 21, 2017	Apr. 19, 2017	Sep. 30, 2017	Jul. 31, 2017	Mar. 31, 2017
Equity [Abstract]
Quarterly cash dividend per share				$ 0.05	$ 0.05
Cash dividend paid	$ 5.4	$ 5.4	$ 10.9

Amount of paid and unpaid common stock dividends declared with the form of settlement in cash.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

Name:	us-gaap_DividendsCommonStockCash
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration