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Significant Accounting Policies (Tables)
 9 Months Ended
Jan. 31, 2014
Accounting Policies [Abstract]  
Currencies which most influence foreign currency translation and the relevant exchange rates
The currencies which most influence our foreign currency translations and the relevant exchange rates were:
 
 
Nine months ended
 
January 31, 2013
 
January 31, 2014
Average rates:
 
 
 
£/US $
1.588848

 
1.582385

CAD/US $
1.001101

 
0.956297

NOK/US $
0.172290

 
0.166683

AUD/US $
1.030734

 
0.927513

€/US $
1.278707

 
1.337860

Period end rates:
 
 
 
£/US $
1.585468

 
1.644932

CAD/US $
1.000801

 
0.899361

NOK/US $
0.182746

 
0.159277

AUD/US $
1.042834

 
0.874179

€/US $
1.358387

 
1.350031