Segment Information - Income (Loss) from Continuing Operations Before Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2016	Jul. 26, 2015	Jul. 31, 2016	Jul. 26, 2015
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Income (loss) before taxes	$ 14,254	$ 1,285	$ 25,547	$ 3,842
Domestic
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Income (loss) before taxes	(6,440)	(3,925)	(13,985)	(17,361)
Canada
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Income (loss) before taxes	6,802	(1,266)	17,917	14,054
United Kingdom
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Income (loss) before taxes	3,193	15,690	10,582	12,344
Switzerland
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Income (loss) before taxes	7,711	(7,070)	7,027	8,348
Japan
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Income (loss) before taxes	1,534	552	2,126	1,062
Other Foreign [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Income (loss) before taxes	$ 1,454	$ (2,696)	$ 1,880	$ (14,605)