Discontinued Operations - Selective Unaudited Financial Information for Equity Method Investment (Details) $ in Thousands	12 Months Ended
	Apr. 30, 2015 USD ($)
Assets
Current assets	$ 150,792
Non-current assets	968,956
Liabilities
Current liabilities	73,971
Non-current liabilities	532,673
Summary Income Statement Information
Net sales	695,628
Gross profit	432,532
Net income	$ 10,385