Valuation and Qualifying Accounts (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jan. 31, 2015	Jan. 31, 2014	Jan. 31, 2013
Valuation and qualifying accounts and reserves
Balance at beginning of year	$ 23,100	$ 20,009	$ 18,758
Net provision charged to operations	32,754	41,316	36,353
Currency revaluation	(324)	(142)	59
Net write-offs	(38,479)	(38,083)	(35,161)
Balance at end of year	17,051	23,100	20,009
Adjustments	1,310	(3,492)	(20,990)
Doubtful Accounts
Valuation and qualifying accounts and reserves
Balance at beginning of year	3,315	4,356	7,741
Net provision charged to operations	1,188	612
Currency revaluation	(132)	(27)	46
Net write-offs	(1,124)	(1,626)	(3,431)
Balance at end of year	3,247	3,315	4,356
Returns
Valuation and qualifying accounts and reserves
Balance at beginning of year	16,323	7,448	8,353
Net provision charged to operations	25,194	35,515	26,130
Currency revaluation	(87)	(63)	(15)
Net write-offs	(32,694)	(26,577)	(27,020)
Balance at end of year	8,736	16,323	7,448
Other Sales Allowances
Valuation and qualifying accounts and reserves
Balance at beginning of year	3,462	8,205	2,664
Net provision charged to operations	6,372	5,189	10,223
Currency revaluation	(105)	(52)	28
Net write-offs	(4,661)	(9,880)	(4,710)
Balance at end of year	5,068	3,462	8,205
Valuation Allowance of Deferred Tax Assets
Valuation and qualifying accounts and reserves
Balance at beginning of year	7,798	11,491	32,856
Currency revaluation	(801)	(201)	(375)
Balance at end of year	8,307	7,798	11,491
Adjustments	$ 1,310	$ (3,492)	$ (20,990)