XML 50 R40.htm IDEA: XBRL DOCUMENT v3.10.0.1
Acquisitions and Dispositions - Additional Information (Detail) - Victoria Plus Albert and Shaws [Member]
$ in Millions
6 Months Ended
Jun. 30, 2018
USD ($)
Business Acquisition [Line Items]  
Business acquisition consideration price paid $ 132.0
Business acquisition additional purchase price consideration $ 5.8