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Fair Value Measurements - Amortized Cost and Fair Market Value of Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Feb. 02, 2019	Feb. 03, 2018	Jan. 28, 2017
Amortized Cost
Mature in one year or less	$ 50,350	$ 31,500
Mature after one year through five years	8,883	25,451
Total	59,233	56,951
Fair Market Value
Mature in one year or less	50,317	31,474
Mature after one year through five years	8,867	25,335
Fair Market Value	59,184	56,809
Changes among the fair value levels
Changes between Level 1 to Level 2, Assets	0	0	$ 0
Changes between Level 2 to Level 1, Assets	$ 0	$ 0	$ 0

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Amount of transfers of assets measured on a recurring basis out of Level 1 of the fair value hierarchy into Level 2.

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Amount after other than temporary impairment (OTTI) accretion, of investments in debt securities classified as held-to-maturity.

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Fair value of held-to-maturity debt securities maturing in the second fiscal year through the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Carrying amount of debt securities accounted for as held-to-maturity, net of adjustments including, but not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized, and fair value hedge accounting adjustments, maturing in the next fiscal year through the fifth fiscal year following the latest fiscal year.

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