Revenue Recognition - Summary of Estimated Revenue Related to Performance Obligations (Detail) $ in Millions	Nov. 30, 2019 USD ($)
Railcar sales
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue type 1	$ 1,400.0
Services
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue type 1	150.0
Other
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue type 1	65.2
Manufacturing | Railcar sales
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue type 1	2,722.9
Manufacturing | Marine
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue type 1	80.2
Manufacturing | Railcars for Syndication
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue type 1	$ 298.3	[1]

[1] Not a performance obligation as defined in Topic 606: Contracts with Customers