Debt (Details) - USD ($) $ in Thousands	Oct. 31, 2015	Jan. 31, 2015	Nov. 01, 2014
Debt Instrument [Line Items]
Long-term debt	$ 395,909	$ 395,562	$ 395,971
6.38% Series A Senior Notes due 2018 [Member]
Debt Instrument [Line Items]
Long-term debt	84,898	84,873	84,865
6.53% Series B Senior Notes due 2021 [Member]
Debt Instrument [Line Items]
Long-term debt	64,877	64,861	64,856
3.375% Senior Notes due 2024 [Member]
Debt Instrument [Line Items]
Long-term debt	$ 246,134	$ 245,828	$ 246,250