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Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands | 12 Months Ended
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May 31, 2016 | May 31, 2015 | May 31, 2014
Valuation and Qualifying Accounts |  |  |
Balance at Beginning of Year | $ 4,834 | $ 3,267 | $ 1,984
Additions - Charged to costs and expenses | 44,433 | 2,313 | 8,161
Deductions | (2,686) | (746) | (6,878)
Balance at End of Period | 46,581 | 4,834 | 3,267
Allowance for deferred tax asset |  |  |
Valuation and Qualifying Accounts |  |  |
Balance at Beginning of Year | 1,791 | 1,531 | 712
Additions - Charged to costs and expenses | 40,685 | 467 | 819
Deductions | (267) | (207) | 0
Balance at End of Period | 42,209 | 1,791 | 1,531
Allowance for sales returns and doubtful accounts |  |  |
Valuation and Qualifying Accounts |  |  |
Balance at Beginning of Year | 3,043 | 1,736 | 1,272
Additions - Charged to costs and expenses | 3,748 | 1,846 | 7,342
Deductions | (2,419) | (539) | (6,878)
Balance at End of Period | $ 4,372 | $ 3,043 | $ 1,736

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- Definition Total of allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 + Details
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- Definition Amount of increase in the allowances and reserves, which consist of the valuation and qualifying accounts that are either netted against the cost of an asset or that reflect a liability established to represent expected future costs, from charges to costs and expenses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 + Details
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- Definition Total of the deductions in a given period to allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs, representing receivables written off as uncollectible and portions of the reserves utilized, respectively. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 + Details
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