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Earnings Per Share - Computation of Basic and Diluted Earnings Per Share (Parenthetical) (Detail) (Redeemable Preferred Stock [Member], USD $)
6 Months Ended
Dec. 31, 2014
Redeemable Preferred Stock [Member]
 
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]  
Preferred stock sold 4,000us-gaap_TemporaryEquitySharesIssued
/ us-gaap_StatementClassOfStockAxis
= us-gaap_RedeemablePreferredStockMember
Preferred stock, par value $ 5,000us-gaap_TemporaryEquityParOrStatedValuePerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_RedeemablePreferredStockMember
Preferred stock dividend rate 9.50%nws_TemporaryEquityDividendRatePercentage
/ us-gaap_StatementClassOfStockAxis
= us-gaap_RedeemablePreferredStockMember
Preferred stock redemption period 10 years