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Derivative Instruments (Details)
 12 Months Ended
Jul. 31, 2015
USD ($)
Jul. 31, 2015
NOK
September 2015 [Member]    
Derivative [Line Items]    
Settlement Date Sep. 30, 2015 Sep. 30, 2015
Amount $ 750,000 NOK 6,163,000
November 2015 [Member]    
Derivative [Line Items]    
Settlement Date Nov. 30, 2015 Nov. 30, 2015
Amount $ 2,729,000 NOK 22,169,000
January 2016 [Member]    
Derivative [Line Items]    
Settlement Date Jan. 31, 2016 Jan. 31, 2016
Amount $ 3,000,000 NOK 24,257,000
May 2016 [Member]    
Derivative [Line Items]    
Settlement Date May 31, 2016 May 31, 2016
Amount $ 1,000,000 NOK 8,239,000
July 2016 [Member]    
Derivative [Line Items]    
Settlement Date Jul. 31, 2016 Jul. 31, 2016
Amount $ 1,000,000 NOK 8,200,000