SEGMENTS - Method of Overhead Allocation (Detail 2) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Jan. 31, 2017	Oct. 31, 2016	Jul. 31, 2016	Apr. 30, 2016	Jan. 31, 2016	Oct. 31, 2015	Jul. 31, 2015	Apr. 30, 2015	Jan. 31, 2017	Jan. 31, 2016	Jan. 31, 2015
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	$ 603,289	$ 883,476	$ 442,267	$ 457,403	$ 527,428	$ 909,865	$ 473,884	$ 432,965	$ 2,386,435	$ 2,344,142	$ 2,116,855
Long-Lived Assets	969,006				281,630				969,006	281,630	247,852
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									2,180,409	2,157,889	1,956,589
Long-Lived Assets	790,341				150,949				790,341	150,949	132,822
Non-United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									206,026	186,253	160,266
Long-Lived Assets	$ 178,665				$ 130,681				$ 178,665	$ 130,681	$ 115,030