Property, Plant and Equipment - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Jul. 31, 2014	Jul. 31, 2016	Jul. 31, 2015	Jul. 31, 2014
Property, Plant and Equipment [Line Items]
Property, plant and equipment		$ 480,436	$ 348,868
Accumulated depreciation		136,169	114,823
Increase in net property, plant and equipment		110,222
Net cash proceeds from land and buildings and improvements	$ 7,352	347	381	$ 8,699
Gain on the sale of land and buildings and improvements	$ 1,888	35	91	$ 1,897
Assets Held under Capital Leases
Property, Plant and Equipment [Line Items]
Property, plant and equipment		6,527	6,527
Accumulated depreciation		680	$ 136
Jayco, Inc.
Property, Plant and Equipment [Line Items]
Increase in net property, plant and equipment		$ 84,507