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Inventories (Details) - USD ($)
$ in Thousands
3 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Jun. 30, 2017
Inventories:      
Raw materials $ 59,128   $ 57,442
Work-in-process 19,286   15,676
Finished goods 46,976   49,486
Net inventory 125,390   122,604
Excess and Obsolete      
Inventories:      
Inventory adjustments 5,300   $ 4,500
Provision for inventories $ 2,200 $ 3,300