Revenue Recognition - Additional Information (Detail 1)	Mar. 31, 2019	Mar. 31, 2018
Minimum | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2018-04-01
Revenue Recognition [Line Items]
Performance obligations, customer satisfaction period		1 month
Minimum | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2019-04-01
Revenue Recognition [Line Items]
Performance obligations, customer satisfaction period	1 month
Maximum | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2018-04-01
Revenue Recognition [Line Items]
Performance obligations, customer satisfaction period		20 months
Maximum | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2019-04-01
Revenue Recognition [Line Items]
Performance obligations, customer satisfaction period	21 months