Restructuring Charges and Asset Impairment Charges - Narrative (Details) - USD ($)	12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2015
Restructuring Cost and Reserve [Line Items]
Restructuring and asset impairment charges	$ 0	$ 18,000,000	$ 29,100,000
Restructuring charges and asset impairment charges		10,400,000
Non-cash impairment charges		7,600,000
Impairment of property plant and equipment		6,500,000
Impairment of intangible assets		1,100,000
Effect on future earnings due to restructuring			30,000,000
Restructuring reserve	0	300,000	2,300,000
Cash payments for restructuring	$ 300,000	3,000,000
Special Termination Benefits
Restructuring Cost and Reserve [Line Items]
Restructuring charges and asset impairment charges		9,400,000
Employee Severance
Restructuring Cost and Reserve [Line Items]
Restructuring charges and asset impairment charges		700,000	12,700,000
Other restructuring charges to be paid in future periods		$ 300,000
Restructuring reserve			2,500,000
Restructuring reserve related to pension plans			8,300,000
Non-cash forfeiture income			400,000
Material development program exit costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges and asset impairment charges			13,400,000
Non-cash impairment charges			5,400,000
Cash payments for restructuring			8,000,000
Site closure costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges and asset impairment charges			3,000,000
Impairment of property plant and equipment			2,600,000
Cash payments for restructuring			$ 400,000