Date when the acquirer obtains control of the acquiree, in CCYY-MM-DD format.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
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- Definition

Aggregate dividends declared during the period for each share of common stock outstanding.

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- Definition

Date the declared dividend will be paid, in CCYY-MM-DD format.

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Date the dividend to be paid was declared, in CCYY-MM-DD format.

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Date the holder must own the stock to be entitled to the dividend, in CCYY-MM-DD format.

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- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

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Subsequent Events - Additional Information (Detail) - $ / shares			6 Months Ended
	Jan. 28, 2016	Jan. 04, 2016	Dec. 31, 2015	Dec. 31, 2014
Subsequent Event [Line Items]
Declared cash dividend, per share			$ 0.35	$ 0.33
Subsequent Event [Member]
Subsequent Event [Line Items]
Declared cash dividend, per share	$ 0.35
Dividend payable, date to be paid	Feb. 23, 2016
Dividend payable, date of record	Feb. 08, 2016
Dividend payable, date declared	Jan. 28, 2016
Subsequent Event [Member] \| TowerSec Ltd. [Member]
Subsequent Event [Line Items]
Business acquisition date		Jan. 04, 2016