CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jan. 31, 2018	Jan. 31, 2017	Jan. 31, 2018	Jan. 31, 2017
Income Statement [Abstract]
Net sales	$ 113,851	$ 79,071	$ 224,515	$ 155,566
Cost of sales	64,597	47,869	128,780	94,681
Gross profit	49,254	31,202	95,735	60,885
Distribution expenses	8,680	9,770	18,122	18,872
Selling, general and administrative expenses	14,999	11,867	28,338	23,233
Amortization of intangible assets	3,885	525	7,396	1,060
Restructuring charges	(40)		69
Operating income	21,730	9,040	41,810	17,720
Other (expense) income
Interest expense, net	(5,086)	(172)	(13,180)	(349)
Loss on the extinguishment of debt	(1,916)		(6,091)
Derivative fair value gain	3,024		3,873
Other, net	(596)	(285)	(777)	(55)
Total other expense, net	(4,574)	(457)	(16,175)	(404)
Income before income taxes	17,156	8,583	25,635	17,316
Provision for income taxes	8,181	(2,097)	5,552	(5,089)
Net income	$ 25,337	$ 6,486	$ 31,187	$ 12,227
Earnings per share
Net income per common share basic	$ 1.64	$ 0.55	$ 2.24	$ 1.03
Net income per common share diluted	$ 1.59	$ 0.53	$ 2.18	$ 1.00
Weighted average shares outstanding
Basic	15,495	11,882	13,923	11,881
Diluted	15,903	12,293	14,285	12,203