Revenue Recognition - Additional Information (Detail 1)	Sep. 30, 2020	Sep. 30, 2019
Minimum | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2019-10-01
Revenue Recognition [Line Items]
Performance obligations, customer satisfaction period		1 month
Minimum | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2020-10-01
Revenue Recognition [Line Items]
Performance obligations, customer satisfaction period	1 month
Maximum | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2019-10-01
Revenue Recognition [Line Items]
Performance obligations, customer satisfaction period		15 months
Maximum | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2020-10-01
Revenue Recognition [Line Items]
Performance obligations, customer satisfaction period	13 months