Long-Term Debt - Components (Details) - USD ($) $ in Thousands	Apr. 30, 2017	Apr. 30, 2016	Apr. 01, 2014
Long-term debt
Total long-term debt	$ 594,920	$ 644,610
Less: Current portion	11,530	35,581
Long-term debt, less current portion	583,390	609,029
Deferred financing costs	5,712	11,147
First Lien Term Loan due 2021
Long-term debt
Total long-term debt	470,245	373,998
Unamortized discount	1,658	1,355	$ 1,950
Deferred financing costs	5,712	6,847
Second Lien Term Loan due 2022
Long-term debt
Total long-term debt		154,517
Unamortized discount	0	1,183	$ 1,600
Deferred financing costs	0	4,300
ABL Facility
Long-term debt
Total long-term debt	103,353	101,910
Capital lease obligations
Long-term debt
Total long-term debt	$ 15,611	$ 11,449
Interest rate	5.50%	5.50%
Installment notes
Long-term debt
Total long-term debt	$ 5,711	$ 2,736
Unamortized discount	$ 751
Installment notes | Maximum
Long-term debt
Interest rate	2.70%	2.70%