The action followed clashes between demonstrators and police on U.S. campuses and a blockade at Paris's Sciences Po university
The group, which trades as B&Q and Screwfix in Britain and Castorama and Brico Depot in France and elsewhere, also reported a fall in underlying sales in its third quarter.
It said group like-for-like sales fell 1.3 percent in the three months to Oct 31. That compares with a rise of 1.6 percent in the previous quarter.