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Stock Plans - Summary of Stock Option Activity (Detail) - Jun. 30, 2015 - $ / shares	Total
Shares
Outstanding Beginning balance	1,618,561
Granted	170,683
Exercised	(31,022)
Forfeited	(3,222)
Expired	(1,109)
Outstanding Ending balance	1,753,891
Exercisable Ending balance	1,300,908
Weighted Average Exercise Price (dollars per share)
Outstanding Beginning balance (dollars per share)	$ 35.74
Granted (dollars per share)	48.64
Exercised (dollars per share)	38.49
Forfeitures (dollars per share)	49.67
Expired (dollars per share)	44.36
Outstanding Ending balance (dollars per share)	36.91
Exercisable Ending balance (dollars per share)	$ 32.48

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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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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock 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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Net number of share options (or share units) granted during the period.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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