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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES AND PRACTICES (Tables) | 3 Months Ended
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Aug. 31, 2015
Estimated Useful Lives of Assets | Depreciation and amortization of assets are computed by the straight-line method over the following estimated useful lives of the assets:
Classification |  | Useful Life |
Buildings |  |  | 20-40 years |
Leasehold improvements |  |  | 2-15 years |
Machinery and equipment |  |  | 2-12 years |
Furniture and fixtures |  |  | 2-10 years |
Computers and computer software |  |  | 2-5 years |
Automobiles |  |  | 2-5 years |
Schedule of Roll Forward Goodwill | A roll forward of goodwill for the three months ended August 31, 2015 is as follows (in thousands):
|  | Three Months Ended August 31, 2015 |
|  | (unaudited) |
|  | MS |  |  | IHT |  |  | Quest Integrity |  |  | Total |
Balance at beginning of period |  | $ | 17,466 |  |  | $ | 60,737 |  |  | $ | 29,570 |  |  | $ | 107,773 |
Acquisitions |  |  | 4,060 |  |  |  | 151,732 |  |  |  | — |  |  |  | 155,792 |
Foreign currency adjustments |  |  | 171 |  |  |  | (960 | ) |  |  | (582 | ) |  |  | (1,371 | )
Balance at end of period |  | $ | 21,697 |  |  | $ | 211,509 |  |  | $ | 28,988 |  |  | $ | 262,194 |
Acquisition of Non-Controlling Interest | Information regarding the acquisition of the non-controlling interest is set forth below (in thousands):
Carrying value of non-controlling interest at May 31, 2015 |  | $ | 6,034 |
Income attributable to non-controlling interest |  |  | — |
Other comprehensive income attributable to non-controlling interest |  |  | — |
Purchase of non-controlling interest |  |  | (6,034 | )
Carrying value of non-controlling interest at August 31, 2015 |  | $ | — |
Amounts Used In Basic and Diluted Earnings Per Share | Amounts used in basic and diluted earnings per share, for the three months ended August 31, 2015 and 2014, are as follows (in thousands):
|  | Three Months Ended August 31, |
|  | 2015 |  |  | 2014 |
|  | (unaudited) |  |  | (unaudited) |
Weighted-average number of basic shares outstanding |  |  | 20,366 |  |  |  | 20,503 |
Stock options, stock units and performance awards |  |  | 335 |  |  |  | 552 |
Conversion of non-controlling interest |  |  | 728 |  |  |  | 225 |
Total shares and dilutive securities |  |  | 21,429 |  |  |  | 21,280 |

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