Revenue Recognition Revenue Recognition (Details 1) - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Mar. 31, 2019	Mar. 31, 2018	Jun. 30, 2018
Net sales	$ 885,443			$ 827,665			$ 2,589,996	$ 2,175,553
Cost of sales	629,884			588,141			1,839,724	1,555,245
Gross profit	255,559			239,524			750,272	620,308
Selling, distribution and administrative expense, including depreciation	189,456			183,080			556,865	465,312
Intangible impairment	31,594			0			31,594	0
Operating income	34,509			56,444			161,813	154,996
Interest expense, net	9,947			8,216			30,001	12,521
Other income, net	(1,256)			(1,291)			(549)	(2,022)
Income before income taxes	25,818			49,519			132,361	144,497
Income tax expense	9,283			12,927			28,171	43,234
Net income	16,535	$ 38,717	$ 48,938	$ 36,592	$ 30,950	$ 33,721	104,190	$ 101,263
Other current assets	49,380						49,380		$ 32,990
Inventories	454,555						454,555		422,069
Other assets	33,761						33,761		23,788
Other current liabilities	62,731						62,731		83,112
Compensation and related benefits	69,324						69,324		73,370
Other liabilities	77,497						77,497		$ 81,720
Retained Earnings	882,848						882,848
Calculated under Revenue Guidance in Effect before Topic 606 [Member]
Net sales	886,012						2,594,882
Cost of sales	630,253						1,843,196
Gross profit	255,759						751,686
Selling, distribution and administrative expense, including depreciation	189,513						557,196
Intangible impairment	31,594						31,594
Operating income	34,652						162,896
Interest expense, net	9,947						30,001
Other income, net	(1,256)						(549)
Income before income taxes	25,961						133,444
Income tax expense	9,320						28,444
Net income	16,641						105,000
Other current assets	40,648						40,648
Inventories	466,016						466,016
Other assets	33,970						33,970
Other current liabilities	69,380						69,380
Compensation and related benefits	68,922						68,922
Other liabilities	76,805						76,805
Retained Earnings	880,229						880,229
Accounting Standards Update 2014-09 [Member] | Difference between Revenue Guidance in Effect before and after Topic 606 [Member]
Net sales	569						4,886
Cost of sales	369						3,472
Gross profit	200						1,414
Selling, distribution and administrative expense, including depreciation	57						331
Intangible impairment	0						0
Operating income	143						1,083
Interest expense, net	0						0
Other income, net	0						0
Income before income taxes	143						1,083
Income tax expense	37						273
Net income	106						810
Other current assets	(8,732)						(8,732)
Inventories	11,461						11,461
Other assets	209						209
Other current liabilities	6,649						6,649
Compensation and related benefits	(402)						(402)
Other liabilities	(692)						(692)
Retained Earnings	$ (2,619)						$ (2,619)