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Prepaid expenses and other current assets (Details) - USD ($)
$ in Thousands
12 Months Ended
Apr. 30, 2017
Apr. 30, 2016
Prepaid expenses and other current assets    
IPO readiness   $ 5,091
Insurance recoveries and other receivables $ 3,727 3,974
Assets held for sale 948 2,598
Prepaid rent 1,771 1,141
Taxes, tags and licenses 838 695
Prepaid supplies 1,104 679
Management fee   375
Prepaid insurance and payroll taxes   257
Refundable income taxes 682  
Other 2,333 1,738
Prepaid expenses and other current assets 11,403 16,548
Land, buildings and building improvements held for sale    
Proceeds received related to assets held for sale $ 1,440 $ 7,093