Condensed Consolidated Income Statements (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019
Income Statement [Abstract]
Net sales	$ 872,483	$ 893,357	$ 2,850,812	$ 2,912,278
Cost of goods sold	777,674	783,342	2,530,020	2,569,570
Gross profit	94,809	110,015	320,792	342,708
Selling, general and administrative expenses	78,923	77,688	244,557	236,569
Depreciation expense	3,493	3,417	10,500	9,954
Intangible amortization expense	5,486	5,005	16,079	14,708
Change in fair value of contingent consideration	618	5,101	6,266	11,535
Operating income	6,289	18,804	43,390	69,942
Interest expense	3,421	3,670	10,964	9,415
Interest income	(1,080)	(682)	(2,629)	(1,397)
Other (income) expense, net	296	21	102	254
Income before income taxes	3,652	15,795	34,953	61,670
Provision for income taxes	1,939	4,080	10,345	15,651
Net income	$ 1,713	$ 11,715	$ 24,608	$ 46,019
Per share data:
Net income per common share, basic (in dollars per share)	$ 0.07	$ 0.46	$ 0.97	$ 1.79
Weighted-average shares outstanding, basic (in shares)	25,346	25,704	25,386	25,647
Net income per common share, diluted (in dollars per share)	$ 0.07	$ 0.45	$ 0.97	$ 1.79
Weighted-average shares outstanding, diluted (in shares)	25,363	25,762	25,444	25,755