Segment Reporting - Summary of Balance Sheet Metrics as Required Under ASC 280 - Segment Reporting Footnotes (Detail) - Waterworks - USD ($) $ in Millions	12 Months Ended	24 Months Ended
Feb. 02, 2019	Feb. 03, 2018	Feb. 02, 2019
Segment Reporting Information
Goodwill impairment	$ 17.4	$ 33.7	$ 51.1
Tradename impairment charge	$ 14.6

Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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