Financial Information by Segment & Geographic Area - Additional Information (Detail)		9 Months Ended	12 Months Ended
	Jun. 28, 2019 Segment	Jun. 28, 2019 Segment	Sep. 30, 2019 Segment Business_Unit
Segment Reporting Information [Line Items]
Number of business reportable segments	3	4
Performance Chemicals [Member]
Segment Reporting Information [Line Items]
Number of business reportable segments			1
Number of business activity | Business_Unit			2