CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical)	6 Months Ended
Jan. 31, 2016	Jan. 31, 2015
Series B Preferred Stock [Member]
Preferred Stock, Dividend Rate, Percentage	6.00%	6.00%

The percentage rate used to calculate dividend payments on preferred stock.

No definition available.

Name:	us-gaap_PreferredStockDividendRatePercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration