Fair Value Measurements (Details) - USD ($)	9 Months Ended	12 Months Ended
	Oct. 31, 2015	Jan. 31, 2015
Transfers of financial instruments between the three levels of fair value hierarchy
Value of transfers between levels	$ 0	$ 0
Assets and liabilities measured at fair value on a recurring basis
Assets:
Foreign exchange currency contracts, Assets	6,280,000	15,542,000
Available-for-sale securities	20,000	36,000
Total Assets	6,300,000	15,578,000
Liabilities:
Foreign exchange currency contracts, Liabilities	145,000	0
Interest rate swap	118,000	270,000
Deferred compensation obligations	10,656,000	9,133,000
Total Liabilities	10,919,000	9,403,000
Assets and liabilities measured at fair value on a recurring basis | Level 1
Assets:
Foreign exchange currency contracts, Assets	0	0
Available-for-sale securities	20,000	36,000
Total Assets	20,000	36,000
Liabilities:
Foreign exchange currency contracts, Liabilities	0	0
Interest rate swap	0	0
Deferred compensation obligations	0	0
Total Liabilities	0	0
Assets and liabilities measured at fair value on a recurring basis | Level 2
Assets:
Foreign exchange currency contracts, Assets	6,280,000	15,542,000
Available-for-sale securities	0	0
Total Assets	6,280,000	15,542,000
Liabilities:
Foreign exchange currency contracts, Liabilities	145,000	0
Interest rate swap	118,000	270,000
Deferred compensation obligations	10,656,000	9,133,000
Total Liabilities	10,919,000	9,403,000
Assets and liabilities measured at fair value on a recurring basis | Level 3
Assets:
Foreign exchange currency contracts, Assets	0	0
Available-for-sale securities	0	0
Total Assets	0	0
Liabilities:
Foreign exchange currency contracts, Liabilities	0	0
Interest rate swap	0	0
Deferred compensation obligations	0	0
Total Liabilities	$ 0	$ 0