Assets Held for Sale (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2018	Jan. 31, 2017	Jan. 31, 2016	Oct. 31, 2016
Long Lived Assets Held-for-sale [Line Items]
Property, plant and equipment, net	$ 106,280	$ 106,324
Goodwill	46,710	40,649	$ 40,672
Amortizable intangible assets, net	10,584	12,048
Other assets	2,950	3,672
Total assets held for sale	326,803	301,509	298,688
Liabilities, current	36,942	28,382
Long-lived asset impairment loss	259	87	3,826
Aerostar
Long Lived Assets Held-for-sale [Line Items]
Goodwill	737	789	$ 789	$ 789
All Segments
Long Lived Assets Held-for-sale [Line Items]
Total assets held for sale		$ 0
Client private product assets | Aerostar
Long Lived Assets Held-for-sale [Line Items]
Property, plant and equipment, net	63
Goodwill	103
Amortizable intangible assets, net	329
Other assets	17
Total assets held for sale	512
Liabilities, current	91
Liabilities	91
Operating Income (Loss) | Client private product assets | Aerostar
Long Lived Assets Held-for-sale [Line Items]
Long-lived asset impairment loss	$ 0