Consolidated Statements of Operations (Unaudited) (Parenthetical) - USD ($) $ in Millions	3 Months Ended
Jul. 31, 2016	Jul. 31, 2015
Redeemable Convertible Preferred Stock
Effect of cumulative preferred dividends in arrears	$ 0.8	$ 0.2

The increase (decrease) during the reporting period in cash disbursements due from investments, representing the shareholders' portion of profits.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585

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