Revenue Recognition - Summary of Gross Up of Sales Return Reserve (Detail) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
May 02, 2020	May 04, 2019	Feb. 01, 2020
Revenue from Contract with Customer [Abstract]
Reserve for sales returns	$ (3,652)	$ (6,286)	$ (3,763)
Cost of inventory returns	$ 2,576	$ 3,372	$ 2,160

It represents the amount of revenue recognition sales returns reserve.

No definition available.

Name:	smrt_RevenueRecognitionSalesReturnsReserve
Namespace Prefix:	smrt_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration