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Valuation and Qualifying Accounts (Details) - USD ($)
$ in Thousands
 12 Months Ended
Jan. 31, 2017
Jan. 31, 2016
Jan. 31, 2015
Valuation and qualifying accounts and reserves      
Balance at beginning of year $ 19,309 $ 17,051 $ 23,100
Net provision charged to operations 40,563 36,143 32,754
Currency revaluation 43 (402) (324)
Net write-offs (38,809) (33,483) (38,479)
Adjustments (191) (568) 29
Balance at end of year 21,106 19,309 17,051
Doubtful Accounts      
Valuation and qualifying accounts and reserves      
Balance at beginning of year 4,274 3,247 3,315
Net provision charged to operations 1,739 2,251 1,188
Currency revaluation 52 (190) (132)
Net write-offs (566) (1,034) (1,124)
Balance at end of year 5,499 4,274 3,247
Returns      
Valuation and qualifying accounts and reserves      
Balance at beginning of year 10,856 8,736 16,323
Net provision charged to operations 30,075 27,433 25,194
Currency revaluation 10 (147) (87)
Net write-offs (29,293) (25,166) (32,694)
Balance at end of year 11,648 10,856 8,736
Other Sales Allowances      
Valuation and qualifying accounts and reserves      
Balance at beginning of year 4,179 5,068 3,462
Net provision charged to operations 8,749 6,459 6,372
Currency revaluation (19) (65) (105)
Net write-offs (8,950) (7,283) (4,661)
Balance at end of year 3,959 4,179 5,068
Deferred Tax Asset Valuation      
Valuation and qualifying accounts and reserves      
Balance at beginning of year 8,089 8,307 7,798
Net provision charged to operations 716 986 1,281
Currency revaluation 100 (636) (801)
Adjustments (191) (568) 29
Balance at end of year $ 8,714 $ 8,089 $ 8,307