Segment Reporting (Tables)

6 Months Ended

Jul. 31, 2016

Segment Reporting [Abstract]

Revenues related to operations in geographic regions

Revenues related to operations in the geographic regions were as follows:

	Three months ended July 31,				Six months ended July 31,
	2016		2015		2016		2015
Revenues:
United States	$	106,460	$	115,598	$	189,680	$	244,789
Europe	47,590		69,520		102,464		115,839
Japan	23,580		15,524		61,512		36,941
Pacific Rim	74,142		77,458		123,109		147,587
Other	2,572		2,962		5,218		8,049
Total revenues	$	254,344	$	281,062	$	481,983	$	553,205