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STOCK PLANS AND STOCK-BASED COMPENSATION (Tables) | 12 Months Ended
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Jun. 30, 2016
Stock Plans And Stock-Based Compensation [Abstract] |
Summary of stock-based compensation expense recognized |
|  | Year ended June 30, |
|  | 2016 |  |  | 2015 |  |  | 2014 |
Stock-based compensation included in indirect costs and selling expense: |  |  |  |  |  |  |  |  |  |  |  |
Restricted stock and RSU expense |  | $ | 17,919 |  |  | $ | 14,072 |  |  | $ | 11,516 |
SSARs and non-qualified stock option expense |  |  | — |  |  |  | — |  |  |  | 41 |
Total stock-based compensation expense |  | $ | 17,919 |  |  | $ | 14,072 |  |  | $ | 11,557 |
Income tax benefit recognized for stock-based compensation expense |  | $ | 6,476 |  |  | $ | 5,260 |  |  | $ | 4,392 |
Summary of activity for outstanding SSARs and stock options |
|  | Number of Shares |  |  | Exercise Price |  |  | Weighted Average Exercise Price |  |  | Weighted Average Grant Date Fair Value |
Outstanding, June 30, 2013 |  |  | 275,550 |  |  | $37.67 – 59.30 |  |  | $ | 48.62 |  |  |  | 17.54 |
Exercisable, June 30, 2013 |  |  | 243,170 |  |  | 37.67 – 59.30 |  |  |  | 48.58 |  |  |  | 17.60 |
Exercised |  |  | (180,370 | ) |  | 45.77 – 49.36 |  |  |  | 48.53 |  |  |  | 17.81 |
Forfeited |  |  | (1,150 | ) |  |  | 49.36 |  |  |  | 49.36 |  |  |  | 17.12 |
Expired |  |  | (2,080 | ) |  |  | 49.36 |  |  |  | 49.36 |  |  |  | 17.12 |
Outstanding, June 30, 2014 |  |  | 91,950 |  |  | 37.67 – 59.30 |  |  |  | 48.77 |  |  |  | 17.02 |
Exercisable, June 30, 2014 |  |  | 91,950 |  |  | 37.67 – 59.30 |  |  |  | 48.77 |  |  |  | 17.02 |
Exercised |  |  | (44,290 | ) |  | 37.67 – 59.30 |  |  |  | 49.36 |  |  |  | 17.33 |
Forfeited |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Expired |  |  | (5,000 | ) |  |  | 47.59 |  |  |  | 47.59 |  |  |  | 10.68 |
Outstanding, June 30, 2015 |  |  | 42,660 |  |  | 37.67 – 49.36 |  |  |  | 48.29 |  |  |  | 17.45 |
Exercisable, June 30, 2015 |  |  | 42,660 |  |  | 37.67 – 49.36 |  |  |  | 48.29 |  |  | $ | 17.45 |
Exercised |  |  | (35,860 | ) |  | 37.67 – 49.36 |  |  |  | 48.18 |  |  |  | 17.25 |
Forfeited |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Expired |  |  | (6,800 | ) |  |  | 48.83 |  |  |  | 48.83 |  |  |  | 18.50 |
Outstanding, June 30, 2016 |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Exercisable, June 30, 2016 |  |  | — |  |  |  | — |  |  | $ | — |  |  | $ | — |
Summary of activity related to SSARs/Non-qualified stock options and RSUs/Restricted shares issued |
|  | SSARs and Stock Options |  |  | Restricted Stock and Restricted Stock Units |
|  | Number of Shares |  |  | Weighted Average Grant Date Fair Value |  |  | Number of Shares |  |  | Weighted Average Grant Date Fair Value |
Unvested at June 30, 2013 |  |  | 32,380 |  |  | $ | 17.02 |  |  |  | 1,042,746 |  |  | $ | 47.74 |
Granted |  |  | — |  |  |  | — |  |  |  | 254,356 |  |  |  | 72.17 |
Vested |  |  | (31,230 | ) |  |  | 17.02 |  |  |  | (360,857 | ) |  |  | 45.07 |
Forfeited |  |  | (1,150 | ) |  |  | 17.12 |  |  |  | (98,003 | ) |  |  | 54.94 |
Unvested at June 30, 2014 |  |  | — |  |  |  | — |  |  |  | 838,242 |  |  |  | 55.39 |
Granted |  |  | — |  |  |  | — |  |  |  | 322,121 |  |  |  | 76.37 |
Vested |  |  | — |  |  |  | — |  |  |  | (250,613 | ) |  |  | 47.84 |
Forfeited |  |  | — |  |  |  | — |  |  |  | (45,184 | ) |  |  | 66.89 |
Unvested at June 30, 2015 |  |  | — |  |  |  | — |  |  |  | 864,566 |  |  |  | 64.79 |
Granted |  |  | — |  |  |  | — |  |  |  | 275,117 |  |  |  | 80.72 |
Vested |  |  | — |  |  |  | — |  |  |  | (209,448 | ) |  |  | 49.48 |
Forfeited |  |  | — |  |  |  | — |  |  |  | (56,381 | ) |  |  | 75.79 |
Unvested at June 30, 2016 |  |  | — |  |  | $ | — |  |  |  | 873,854 |  |  | $ | 71.20 |
Summary of information regarding cash proceeds received, intrinsic value and total tax benefits realized resulting from stock options exercises |
|  | Year ended June 30, |
|  | 2016 |  |  | 2015 |  |  | 2014 |
Cash proceeds received |  | $ | — |  |  | $ | 872 |  |  | $ | — |
Intrinsic value realized |  | $ | 1,286 |  |  | $ | 1,646 |  |  | $ | 3,868 |
Income tax benefit realized |  | $ | 465 |  |  | $ | 615 |  |  | $ | 1,470 |
Summary of activity related to MSPP And DSPP |
|  | MSPP |
RSUs outstanding, June 30, 2015 |  |  | 5,905 |
Granted |  |  | 703 |
Issued |  |  | (5,215 | )
Forfeited |  |  | — |
RSUs outstanding, June 30, 2016 |  |  | 1,393 |
Weighted average grant date fair value as adjusted for the applicable discount |  | $ | 73.72 |

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- Definition Tabular disclosure of the amount of cash proceeds received from the exercise of stock options and similar instruments granted under share-based payment arrangements and the tax benefit realized from stock options exercised during the period. Disclosure may also include the intrinsic value of stock options exercised during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the amount of total share-based compensation cost, including the amounts attributable to each share-based compensation plan and any related tax benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of employee stock purchase plan activity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for stock options and stock appreciation rights that were outstanding at the beginning and end of the year, exercisable at the end of the year, and the number of stock options and stock appreciation rights that were granted, exercised or converted, forfeited, and expired during the year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References No definition available. + Details
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