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Other Financial Data (Tables) | 12 Months Ended
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May 31, 2017
Other Financial Data Disclosure [Abstract] |
Schedule of other financial data | Other financial data consisted of the following for the fiscal years ended May 31:
| 2017 |  | 2016 |  | 2015
Advertising expense | $ | 121.0 |  |  | $ | 127.3 |  |  | $ | 129.7 |
Amortization of prepublication and production costs | 23.3 |  |  | 26.4 |  |  | 30.4 |
Foreign currency transaction gain (loss) | 1.0 |  |  | (0.5 | ) |  | 0.1 |
Purchases related to contractual commitments for minimum print quantities | 53.1 |  |  | 48.7 |  |  | 68.2 |
| 2017 |  | 2016
Royalty advances allowance for reserves | $ | 93.8 |  |  | $ | 90.1 |
Accounts receivable reserve for returns | 36.3 |  |  | 32.1 |
Accounts receivable allowance for doubtful accounts | 13.7 |  |  | 16.1 |
Unredeemed credits issued in conjunction with the Company’s school-based book club and book fair operations (included in other accrued expenses) | 8.7 |  |  | 8.9 |

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