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Other Financial Data | 12 Months Ended
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May 31, 2016
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:
| 2016 |  | 2015 |  | 2014
Advertising expense | $ | 127.3 |  |  | $ | 129.7 |  |  | $ | 123.4 |
Amortization of prepublication and production costs | 26.4 |  |  | 30.4 |  |  | 32.9 |
Foreign currency transaction gain (loss) | (0.5 | ) |  | 0.1 |  |  | (1.0 | )
Purchases related to contractual commitments for minimum print quantities | 48.7 |  |  | 68.2 |  |  | 62.8 |
| 2016 |  | 2015
Prepublication and production costs | $ | 42.0 |  |  | $ | 51.7 |
Accounts receivable reserve for returns | 32.1 |  |  | 27.9 |
Unredeemed credits issued in conjunction with the Company’s school-based book club and book fair operations (included in other accrued expenses) | 8.9 |  |  | 9.3 |

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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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