Restructuring - Additional Information (Detail) - USD ($)	3 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Restructuring Cost And Reserve [Line Items]
Restructuring charges	$ 3,000,000
2020 Reorganization [Member]
Restructuring Cost And Reserve [Line Items]
Severance costs		$ 7,000,000
Restructuring charges expected throughout rest of 2021 related to site demolition and severance costs	2,000,000
Restructuring charges expected thereafter fiscal year related to site demolition and severance costs	3,000,000
Restructuring cash payments of fiscal year	2,000,000	1,000,000
Restructuring cash payments through the reminder of fiscal 2021	3,000,000
Restructuring future cash payments thereafter fiscal year	4,000,000
Accrued severance charges	2,000,000
Restructuring charges	17,000,000
2020 Reorganization [Member] | Severance and Employee Benefits [Member]
Restructuring Cost And Reserve [Line Items]
Payment for restructuring	15,000,000
2020 Reorganization [Member] | Maximum [Member]
Restructuring Cost And Reserve [Line Items]
Severance costs	1,000,000
Purification Solutions Transformation Plan [Member]
Restructuring Cost And Reserve [Line Items]
Severance costs	1,000,000
Restructuring cash payments through the reminder of fiscal 2021	2,000,000
Restructuring future cash payments thereafter fiscal year	2,000,000
Accrued severance charges	1,000,000
Restructuring charges	14,000,000
Restructuring charges expected throughout rest of 2021 related to decommissioning and severance costs	2,000,000
Restructuring charges expected thereafter fiscal year related to decommissioning and severance costs	1,000,000
Purification Solutions Transformation Plan [Member] | Manufacturing Facility [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring charges	3,000,000	1,000,000
Purification Solutions Transformation Plan [Member] | Severance and Employee Benefits [Member]
Restructuring Cost And Reserve [Line Items]
Payment for restructuring	$ 10,000,000
Purification Solutions Transformation Plan [Member] | Maximum [Member]
Restructuring Cost And Reserve [Line Items]
Severance costs		$ 1,000,000