Segment Reporting (Tables)

6 Months Ended

Jul. 31, 2015

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,
	2015		2014		2015		2014
Revenues:
United States	$	115,598	$	111,692	$	244,789	$	236,458
Europe	69,520		55,462		115,839		115,611
Japan	15,524		20,973		36,941		42,254
Pacific Rim	77,458		62,963		147,587		106,676
Other	2,962		9,143		8,049		11,385
Total revenues	$	281,062	$	260,233	$	553,205	$	512,384