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Other Financial Data | 12 Months Ended
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May 31, 2018
Other Financial Data Disclosure [Abstract] |
Other Financial Data | OTHER FINANCIAL DATA Other financial data consisted of the following for the fiscal years ended May 31:
| 2018 |  | 2017 |  | 2016
Advertising expense | $ | 110.0 |  |  | $ | 121.0 |  |  | $ | 127.3 |
Amortization of prepublication and production costs | 21.8 |  |  | 23.3 |  |  | 26.4 |
Foreign currency transaction gain (loss) | (0.0 | ) |  | 1.0 |  |  | (0.5 | )
Purchases related to contractual commitments for minimum print quantities | 54.2 |  |  | 53.1 |  |  | 48.7 |
Other financial data consisted of the following at May 31:
| 2018 |  | 2017
Royalty advances allowance for reserves | $ | 97.0 |  |  | $ | 93.8 |
Accounts receivable reserve for returns | 30.0 |  |  | 36.3 |
Accounts receivable allowance for doubtful accounts | 12.4 |  |  | 13.7 |

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- Definition Disclosure relating to financial data which are material and for which a more specific and appropriate taxonomy is not available. + References No definition available. + Details
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