2023 Restructuring and other costs - Narrative (Details)		12 Months Ended
	May 03, 2023 employee	Sep. 30, 2023 USD ($)
Restructuring Cost and Reserve [Line Items]
Other restructuring costs		$ 3,500,000
Severance costs		0
2023 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected number of positions eliminated | employee	270
Restructuring and related cost, number of positions eliminated, period percent	25.00%
Restructuring charges		9,384,000
Restructuring reserve		517,000
2023 Restructuring Plan | Severance and related benefit costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges		8,467,000
Restructuring reserve		517,000
2023 Restructuring Plan | Other associated costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges		917,000
Restructuring reserve		0
2023 Restructuring Plan | Pre-Tax Restructuring
Restructuring Cost and Reserve [Line Items]
Restructuring charges		$ 12,700,000