Changes in Accounting Principles and Corrections to Previously Issued Financial Statements Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2015
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Unrealized (losses) gains on derivative instruments designated as cash flow hedges, net of tax									$ (5,922)
Losses (gains) on derivative instruments designated as cash flow hedges reclassified to cost of goods sold, net of tax									$ 800
Percentage of LIFO Inventory	91.00%								91.00%
Comprehensive Income (Loss), Net of Tax, Attributable to Parent									$ (18,826)	$ 27,627	$ 70,974
Inventories	$ 104,431				$ 79,790				104,431	79,790
Deferred income taxes	39,308				53,933				39,308	53,933
Retained earnings	220,307				236,993				220,307	236,993
Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax	62,039				61,493				62,039	61,493
Income (loss) before taxes									968	(37,366)	448
Income tax expense (benefit)									17,312	14,815	(72,239)
Net (loss) income	133	$ (2,193)	$ (17,060)	$ 840	(1,837)	$ 2,846	$ 20,728	$ 814	(18,280)	22,551	71,791
Gross profit	52,599	52,211	56,191	46,041	42,775	49,882	49,494	44,727	207,042	186,878	171,168
Selling expenses	41,256	$ 38,041	$ 42,414	$ 32,828	33,230	$ 34,388	$ 32,408	$ 33,303	154,539	133,329	123,260
LIFO to FIFO Adjustment
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Unrealized (losses) gains on derivative instruments designated as cash flow hedges, net of tax										(2,900)	400
Losses (gains) on derivative instruments designated as cash flow hedges reclassified to cost of goods sold, net of tax										500	10,300
Cumulative Effect on Retained Earnings, Net of Tax												$ 17,700
Comprehensive Income (Loss), Net of Tax, Attributable to Parent										27,600	71,000
As Previously Reported
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Inventories					56,251					56,251
Deferred income taxes					63,055					63,055
Retained earnings					221,182					221,182
Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax					$ 60,099					60,099
Income (loss) before taxes										(40,354)	(9,921)
Income tax expense (benefit)										15,954	(79,997)
Net (loss) income										24,400	89,918
Gross profit										213,735	208,475
Selling expenses										157,198	150,198
As Previously Reported | LIFO to FIFO Adjustment
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Unrealized (losses) gains on derivative instruments designated as cash flow hedges, net of tax										(2,900)	200
Losses (gains) on derivative instruments designated as cash flow hedges reclassified to cost of goods sold, net of tax										(1,100)	8,100
Comprehensive Income (Loss), Net of Tax, Attributable to Parent										$ 27,900	$ 86,700
Scenario, Plan [Member] | LIFO to FIFO Adjustment
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Inventories	18,100								18,100
Deferred income taxes	(4,200)								(4,200)
Retained earnings	17,500								17,500
Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax	(3,600)								(3,600)
Income (loss) before taxes									(1,700)
Income tax expense (benefit)									(900)
Net (loss) income									$ 2,600
Earnings Per Share, Basic and Diluted (dollars per share)									$ 0.15
Scenario, Plan [Member] | Preferable Freight and Warehousing Adjustments
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Inventories	5,900								$ 5,900
Deferred income taxes	(1,400)								(1,400)
Retained earnings	$ 4,500								4,500
Income (loss) before taxes									(2,100)
Income tax expense (benefit)									(1,000)
Net (loss) income									$ 3,100
Earnings Per Share, Basic and Diluted (dollars per share)									$ 0.19
Gross profit									$ 21,600
Selling expenses									$ (23,700)