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Business and Summary of Significant Accounting Policies - Accounts Receivable, Net (Details) - USD ($) $ in Millions | Jan. 31, 2018 | Jan. 31, 2017
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Accounting Policies [Abstract] |  |
Trade accounts receivable | $ 469.2 | $ 477.5
Less: Allowance for doubtful accounts | (2.3) | (1.5)
Product returns reserve | (0.2) | (0.2)
Partner programs and other obligations | (28.5) | (23.5)
Accounts receivable, net | $ 438.2 | $ 452.3

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