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Stock Option Activity (Detail) - Jun. 30, 2015 - $ / shares	Total
Underlying Shares
Outstanding at beginning of year	6,086,250
Granted	831,000
Exercised
Cancelled	(10,000)
Expired	(300,000)
Outstanding at end of year	6,607,250
Exercisable at end of year	5,333,927
Weighted Average Exercise Price
Outstanding at beginning of year	$ 22.32
Granted	$ 20.06
Exercised
Cancelled	$ 16.59
Expired	24.63
Outstanding at end of year	21.94
Exercisable at end of year	$ 21.62

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements.

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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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