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Revenue (Details 1) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2018	Jul. 31, 2017	Jul. 31, 2018	Jul. 31, 2017
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Net sales	$ 144,093	$ 128,781	$ 271,242	$ 228,046
Gross profit	77,834	66,126	145,358	115,263
Net income	9,140	$ 5,482	17,255	$ 1,323
ASU 2014-09 | Amounts Without Adoption
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Net sales	145,210		270,184
Gross profit	78,323		144,848
Net income	9,384		16,982
ASU 2014-09 | Impact of Adoption
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Net sales	(1,117)		1,058
Gross profit	(488)		510
Net income	$ (244)		$ 273

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Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity.

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